CSIP score +0.29 (approximate range +0.25 to +0.34, which understates the uncertainty); negative is left of the scale’s centre, positive right. From 25 donors and 579 roll calls.
CSIP places every official on one left–right scale estimated from roll-call votes, campaign donations and the text of statements; 0 is the centre of the scale, not a definition of moderate. The share says where Larson sits among State Senate Democrats, not how far from the centre.
At a glance
6 measures against State Senate Democrats. 62% of Larson’s itemized money in the 2024 cycle came from South Dakota, in the bottom quarter of State Senate Democrats. 78% of the 175 bills Larson sponsored got out of committee, in the bottom half of the South Dakota Senate.
The measures on which Larson sits furthest from the middle of State Senate Democrats, each against the same group, with the CSIP score when there is one. Every number is explained in its own section below.
CSIP ideology
More conservative than 99% of State Senate Democrats · ± 0.05
Party unity
South Dakota Senate average 76% · ranks 1st of 35 · 6 votes against the majority of South Dakota Senate Democrats
From South Dakota, 2024
Of itemized individual dollars · ranks 42nd of 47 State Senate Democrats
Attendance
South Dakota Senate average 96.6% · ranks 5th of 35 · 567 roll calls
Out of committee
South Dakota Senate average 78% · ranks 21st of 34
Itemized, 2024
State Senate Democrats’ median $16.2K · ranks 32nd of 55
Peer group: State Senate Democrats. Rank 1 is the highest value in the group; the thick bar is Larson, the thin grey bar the peer average. The headline is the measure on which Larson is most unusual among peers (Methods, §08).
What Larson says
No statements for the SD 2025–26 session.No classified statements (posts, press releases, newsletters, floor speeches) in this time window.
Policy
No policy statements for the SD 2025–26 session.No classified statements (posts, press releases, newsletters, floor speeches) in this time window.
Ideology
Larson sits at +0.29 on the CSIP scale, right of 0, more conservative than 99% of State Senate Democrats. Approximate range +0.25 to +0.34, which understates the uncertainty; from 25 donors and 579 roll calls.
CSIP, the lab’s Common-Space Ideal Point, places every official, federal and state, on one left–right scale, estimated from roll-call votes, who gives money to whom, and the text of statements. Negative is left of 0, positive right of it; 0 is the centre of the scale, not a definition of “moderate”.
CSIP ideal point
Approximate range +0.25 to +0.34. From 25 donors and 579 roll calls. Run 2026-10-25T215945. Blue is left of 0, red right of 0.
The outlined dot is Larson, coloured by its side of 0 (blue left, red right, deeper further out); the bar through it is the approximate range (±1.96 standard errors), which understates the uncertainty; the grey ticks below are the medians of Larson’s groups. 0 is the centre of the scale, not “moderate” by definition.
What this means, and what it doesn’t
The score summarises how an official votes, who funds them and how they talk, relative to everyone else. It does not grade positions as good or bad, and two officials with the same score can differ on any single issue. The ± range is 1.96 standard errors, which understates the uncertainty: scores whose ranges overlap may not differ at all, and even scores whose ranges do not overlap may not differ.
Where Larson sits
Every official in each group, on the CSIP scale
Show the data
| Group | Officials | Median | Share left of Larson |
|---|---|---|---|
| State Senate Democrats | 825 | −0.7 | 99% |
| South Dakota Senate | 35 | +0.1 | 71% |
| All State Senate | 1909 | +0.1 | 65% |
How to read the strips
Every small dot is one official on the same scale, coloured by its own score (blue left of 0, red right of 0, grey at 0, deeper further out) and spread up and down only to keep dots apart; where a group is crowded the dots overlap, and darker patches mean more officials. The large outlined dot is Larson in every row; the rule is each group’s median. The table under the figure gives the share of each group to the left of Larson.
Money
Larson reported $12.2K in the 2024 cycle, below the State Senate Democrats’ median of $16.2K. State filings report no small-donation total. 62% of itemized individual money came from South Dakota.
Campaign money from state campaign-finance filings, as aggregates only; the lab never shows an individual donor. Campaigns must report by name every person who gives them more than $200 in a cycle (“itemized”); smaller gifts are reported only as one total (“unitemized”), so donor counts, donor states, employers and occupations describe itemized donors only. State filings report no small-gift total, so these figures add up itemized contributions only.
itemized in the 2024 cycle
From 3 itemized donors. State Senate Democrats’ median $16.2K.
Where the money came from
Each square is one percent of itemized contributions in the 2024 cycle.
- Individuals (itemized)58 squares$7,070
- PACs and other committees42 squares$5,100
Show the data
| Source | Amount | Share |
|---|---|---|
| Individuals (itemized) | $7,070 | 58.1% |
| PACs and other committees | $5,100 | 41.9% |
What this means, and what it doesn’t
Totals say how much a campaign took in, not how it was spent, and they rise sharply when a seat is up for election; compare cycles with that in mind.
Receipts by cycle
Itemized contributions, 2020 to 2024. The grey line is the State Senate Democrats’ median for 2024.
Show the data
| Item | Value |
|---|---|
| 2020 cycle | $1,000 |
| 2022 cycle | $35.5K |
| 2024 cycle | $12.2K |
Top donor states, 2024
Itemized contributions by donor state. 62% came from South Dakota.
- South Dakota$4,370
- Pennsylvania$500
- District of Columbia$500
- North Dakota$350
- Tennessee$300
Small donations
State filings report no total for small gifts.
Not reported in state filings.
Where itemized donors live
Individuals who gave more than $200, by donor state
Show the data
| State | Value |
|---|---|
| South Dakota | $4,370 |
| Pennsylvania | $500 |
| District of Columbia | $500 |
| North Dakota | $350 |
| Tennessee | $300 |
| Massachusetts | $250 |
| Virginia | $250 |
| Oregon | $200 |
| Arizona | $200 |
| Maryland | $150 |
| Alaska | No data |
| Maine | No data |
| Vermont | No data |
| New Hampshire | No data |
| Washington | No data |
| Idaho | No data |
| Montana | No data |
| Minnesota | No data |
| Illinois | No data |
| Wisconsin | No data |
| Michigan | No data |
| New York | No data |
| Rhode Island | No data |
| Nevada | No data |
| Wyoming | No data |
| Iowa | No data |
| Indiana | No data |
| Ohio | No data |
| New Jersey | No data |
| Connecticut | No data |
| California | No data |
| Utah | No data |
| Colorado | No data |
| Nebraska | No data |
| Missouri | No data |
| Kentucky | No data |
| West Virginia | No data |
| Delaware | No data |
| New Mexico | No data |
| Kansas | No data |
| Arkansas | No data |
| North Carolina | No data |
| South Carolina | No data |
| Oklahoma | No data |
| Louisiana | No data |
| Mississippi | No data |
| Alabama | No data |
| Georgia | No data |
| Hawaii | No data |
| Texas | No data |
| Florida | No data |
itemized donors
People who gave more than $200
from South Dakota
Of itemized individual dollars
How to read the map
Every state the same size. Darker states gave more itemized money; hatched states had no itemized donors; the outlined state is South Dakota. Gifts of $200 or less carry no address and are left out.
Top donor occupations
Itemized, 2024 cycle.
No occupations reported.
Top committees
PAC and committee contributions, 2024 cycle.
- SD CORN GROWERS ASSN PAC$1,000
- THE MAJORITY PROJECT$1,000
- BNSF RAILPAC (00235739)$500
- DEMOCRATIC FORUM OF SOUTHEAST DAKOTA$500
- SOUTH DAKOTA CERTIFIED REGISTERED NURSE ANESTHETISTS$500
Top employers
Itemized, 2024 cycle.
No employers reported.
Aggregates only. Individual donors are never named.
Votes
Larson voted with the majority of South Dakota Senate Democrats on 98.4% of party-line votes and missed none of 567 roll calls. South Dakota Senate on average: 76% party unity, 96.6% attendance. Across all roll calls, Larson voted against the majority of South Dakota Senate Democrats 6 times.
567 roll calls Larson could vote on in the SD 2025–26 session, compared with South Dakota Senate. Attendance is the share with a vote recorded. Party unity counts only party-line roll calls, where most Democrats and most Republicans voted on opposite sides, and is the share of those where Larson voted with the majority of South Dakota Senate Democrats. The count of votes against that majority covers every roll call where the majority took a side.
votes against the majority of South Dakota Senate Democrats
Party unity 98.4%, South Dakota Senate average 76%, ranks 1st of 35. 567 roll calls in the SD 2025–26 session.
Attendance and party unity
The thick bar is Larson, the thin grey bar the South Dakota Senate average. The scale runs from 70% to 100% to show the gap.
Show the data
| Row | Larson | Peers |
|---|---|---|
| Attendance | 100% | 96.6% |
| Party unity | 98.4% | 76% |
What this means, and what it doesn’t
A missed roll call has many causes, from illness to campaigning, so attendance says how often, not why. A vote against the majority can be on procedure as well as substance, and many fall on roll calls where both parties split; the key votes below show the ones that decided something.
Key votes
25 roll calls the lab flagged as key in the SD 2025–26 session
| Party split (yea–nay) | Why it’s key | |||||
|---|---|---|---|---|---|---|
| Mar 12, 2026 | HB 1326 appropriate money for the ordinary expenses of the legislative, judicial, and executive departments of the state, the current expenses of state institutions, interest on the public debt, and common schools. Do Pass | Yea | With majority | pass | D 3–0 · R 22–9Democrats 3 yea, 0 nay; Republicans 22 yea, 9 nay | became law · party crossover |
| Mar 12, 2026 | HB 1051 revise property tax levies for school districts and to revise the state aid to general and special education formulas. Do Pass Amended | Yea | With majority | pass | D 3–0 · R 31–0Democrats 3 yea, 0 nay; Republicans 31 yea, 0 nay | became law |
| Mar 12, 2026 | Yea | With majority | pass | D 3–0 · R 23–8Democrats 3 yea, 0 nay; Republicans 23 yea, 8 nay | became law · party crossover | |
| Mar 9, 2026 | HB 1006 create a taskforce to study the creation of Indian medicaid managed care entities in the state. Do Pass Amended | Yea | With majority | pass | D 3–0 · R 29–2Democrats 3 yea, 0 nay; Republicans 29 yea, 2 nay | became law |
| Mar 9, 2026 | HB 1241 modify the requirements for public notice of a hearing prior to a vote to impose an excess tax levy, and to modify requirements to refer an excess tax levy of a school district to a vote. Do Pass Amended | Nay | With majority | fail | D 1–2 · R 16–15Democrats 1 yea, 2 nay; Republicans 16 yea, 15 nay | close vote · party crossover |
How key votes are chosen
Automatically: a final-passage or override vote where the measure became law, the margin was under 10%, at least 10% of either party voted against its majority, or the bill was among the 25 most mentioned in officials’ own statements. Up to 25 per window, most recent first; five are shown. Bars show yea on the left, nay on the right, per party.
Votes most often with
The colleagues who voted the same way as Larson most often
- Jamie SmithD563 shared votes96%
- Brandon WipfR299 shared votes87%
- Glen VilhauerR567 shared votes85%
- Paul MiskiminsR564 shared votes85%
- Tim ReedR562 shared votes85%
Votes least often with
The colleagues who voted the same way as Larson least often
- John CarleyR545 shared votes48%
- Taffy HowardR566 shared votes55%
- Tom PischkeR558 shared votes59%
- Greg BlancR566 shared votes60%
- Sam MartyR566 shared votes61%
How to read the agreement lists
The share of roll calls both members voted on where they voted the same way, among colleagues sharing at least 50 such votes. High agreement with members of the other party is common on routine votes.
Full voting record
SD 2025–26 session, loads in batches
Legislation
Larson sponsored 175 bills in the SD 2025–26 session; 64 became law. Cosponsored 0 others. 78% of sponsored bills got out of committee (South Dakota Senate average 78%; 21st of 34).
The bills Larson sponsored and cosponsored in the SD 2025–26 session, from the official bill records, and how far each got: introduced, referred to or acted on in committee, passed one chamber, passed both, became law. A bill counts at every stage it has reached, so the blocks only shrink to the right.
Bills by stage
Counts for the SD 2025–26 session
Show the data
| Role | Introduced | In committee | Passed one chamber | Passed both chambers | Became law |
|---|---|---|---|---|---|
| Sponsored | 175 | 163 | 79 | 67 | 64 |
| Cosponsored | 0 | 0 | 0 | 0 | 0 |
How to read the blocks
Ink blocks are bills Larson sponsored, ochre blocks bills Larson cosponsored; the figure above each block is the count. Most bills in any legislature never leave committee, so a short staircase is the norm.
of sponsored bills got out of committee
South Dakota Senate average 78%. Ranks 21st of 34.
Cosponsorship partners
Colleagues who most often cosponsor with Larson, by number of shared bills in the SD 2025–26 session; the square shows their party.
- Eric Emery107
- Erik Muckey102
- Nicole Uhre-Balk78
- Carl Perry77
- Kadyn Wittman58
What this means, and what it doesn’t
The score is the share of sponsored bills that a committee reported out or a chamber passed, with at least 5 sponsored bills, ranked within the peer group. Members of the majority party and committee chairs move more bills, so the rank reflects position in the chamber as well as effort. Cosponsorship partners are the five colleagues who share the most of Larson’s bills; the toggle shows more.
Bill list
Sponsored and cosponsored, with status and policy area; five are shown, the toggle shows the rest
| SC 817 | honoring the 2025-2026 Canton C-Hawk girls wrestling team. | Sponsor | Mar 3, 2026 | Introduced | Unassigned | Withdrawn at the Request of the Prime Sponsor , Passed, S.J. 449 Mar 3, 2026 |
| SB 110 | regulate how broadband internet access service providers use customer data. | Sponsor | Feb 23, 2026 | Passed one chamber | Science, Technology, Communications(model) | Commerce and Energy Deferred to the 41st legislative day , Passed, YEAS 10, NAYS 2 Mar 2, 2026 |
| HB 1148 | adopt the respiratory care interstate compact. | Sponsor | Feb 18, 2026 | Became law | Health(model) | Signed by the Governor on 2026-03-30 H.J. 579 Mar 30, 2026 |
| HB 1149 | adopt the athletic trainer licensure compact. | Sponsor | Feb 17, 2026 | Became law | Health(model) | Signed by the Governor on 2026-03-30 H.J. 578 Mar 30, 2026 |
| SB 139 | revise a provision related to the transportation of an inmate upon discharge from a correctional facility. | Sponsor | Feb 10, 2026 | Became law | Crime and Law Enforcement(model) | Signed by the Governor on 2026-03-30 S.J. 548 Mar 30, 2026 |
Online
A site that has not changed in 90 days. Larson’s official site had 1 page when last crawled on Oct 1, 2026.
The lab crawls Larson’s official and campaign websites (weekly for Congress, monthly for the states) and keeps every page’s text, so changes can be read later; it also records social accounts and describes the images Larson posts with a vision model.
Websites
- 1
pages crawled
0changes in 90 days
- 6
pages crawled
8changes in 90 days
How to read the counts
“Pages crawled” is the size of the site at the last crawl; “changes in 90 days” counts pages whose text differed from the previous crawl. Sites change for many routine reasons, such as new press releases, so a high count is not by itself notable.
Social accounts
Images Larson posted
No images from Larson’s posts have been described.
About the descriptions
Written by a vision model and may be wrong. Open the post to see the original. Five are shown; the toggle shows the rest.
State floor speeches
No transcribed state floor speeches are matched to this legislator yet.
Floor speeches
Transcribed from chamber video or captions by the lab. They are not classified for kinds of statement.
Methods and sources
How this page was made. Profile built Oct 28, 2026; site last built Oct 28, 2026. Every number on the page is computed from the sources listed here, by the same rules for every official; nothing is written by hand.
The headline
The headline is the measure on which Larson is most unusual among State Senate Democrats, chosen by one rule for every official of every party. The candidates are the rate of each kind of statement and of extreme labels, party unity, attendance, the small-donor share, the in-state share and total receipts of the latest cycle, the share of sponsored bills that got out of committee, talk-to-bills agreement, and the CSIP score’s place within the party group.
The builder ranks every measure within the same peer group the page compares it with, and writes each official’s percentile: the share of the group below the value, ties counting half, so 0.5 is the median and a value shared by many never ranks first. A measure’s score is how far that percentile sits from the median (0 in the middle, 0.5 at either end), and the highest score leads if it is above 0.25, outside the middle half of the group. Scores within 0.03 of each other are a tie, broken in this order: votes against the party majority, kinds of statement, ideology, roll calls missed, small donations, in-state money, legislation, agreement, extreme labels, receipts.
A measure counts only with at least 200 statements, 100 roll calls or 5 sponsored bills behind it and a peer group of at least 10. Two things never lead: high party unity or attendance, where most members sit, and a high rate of a kind of statement backed by fewer than 10 statements. When nothing qualifies, the headline is a neutral fact instead: statements classified, or years in office. The wording always names the direction (“in the bottom 5% of …”, “votes against the majority of …”).
Identifiers
- Profile id
- 81df3498-7677-4749-9753-c1ae9799e444
- Open States
- ocd-person/81df3498-7677-4749-9753-c1ae9799e444
Bulk files with the same data for every official:
Freshness of this profile’s data
- What politicians sayOct 27, 20261 days agoMembers of Congress: tweets since 2017; press releases, newsletters and floor speeches since 2022. State legislators: tweets since May 2024. Governors: tweets since January 2025. Labels from an LLM classifier.
- Roll calls (state)Oct 21, 20267 days agoOpen States floor roll calls, 2019 on (none for AK and MO).
- Bills (state)Oct 28, 2026todayOpen States bills and sponsors, 2019 on; stages from roll calls.
- Campaign money (state)no dateState campaign-finance agencies, 2019 on; aggregates only.
- Ideology (CSIP)Oct 25, 20263 days agoCommon-Space Ideal Points (CSIP), current validated run.
- WebsitesOct 25, 20263 days agoWeekly crawls of federal sites since April 2026; monthly state crawls since June 2026.
- State floor speechesOct 21, 20267 days agoState floor speech turns (published transcripts and captions), 2020 on; not LLM-classified.
How the measures work
- What politicians say
- Every post, press release, newsletter and congressional floor speech is read by a language model and marked for personal attacks, policy criticism, policy discussion, bipartisanship and credit claiming. A statement can be in several. Rates are shares of statements in the window. The methods paper.
- Extreme labels
- A statement has an extreme label when it calls a politician, party or policy “far left”, “far right”, “MAGA”, “extreme”, “radical”, “woke”, “fascist” or “communist”. The target is who the label is aimed at.
- Policy areas and agreement
- Statements and bills share 25 Congressional Research Service policy areas (state bills are assigned by a language model). Agreement is 1 − Jensen–Shannon distance between the two distributions, shown with at least 20 policy statements and 5 bills.
- Ideology (CSIP)
- Common-Space Ideal Points place federal and state officials on one left–right scale, estimated jointly from roll calls, campaign contributions and the text of statements, with standard errors. Only a validated run is shown. The methods paper.
- Campaign money
- Campaigns report by name only donors who give more than $200 in a cycle; smaller gifts are reported as one total. Federal totals and the small-donor share come from the FEC’s financial summaries of each campaign committee. Donor counts, donor states, employers and occupations cover itemized donors only. State filings report no small-gift totals, so state figures are itemized only. The lab never publishes donor names.
- Votes and key votes
- Attendance, party unity and the count of votes against the majority of an official’s own party come from roll calls (Voteview for Congress, chamber records for the states). Key votes are final-passage or override votes that became law, were decided by under 10%, saw at least 10% of a party vote against its majority, or concerned one of the 25 bills most mentioned in officials’ statements.
- Peers and ranks
- Comparisons are with the same party, chamber and level (for example House Democrats); state legislators are compared within their state and chamber for votes. Every comparison names its group. Rank 1 is the highest value in the group; tied values share the average of their ranks, and the percentile is the share of the group below the value, ties counting half.
America’s Political Pulse · Polarization Research Lab