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U.S. Senator · Iowa
Chuck Grassley
RepublicanState R+6119th Congress
Typical swing score60#25 of 100 senators across tracked bills
Contact Chuck Grassley’s office
Official D.C. office details from the congress-legislators datasetWashington, D.C. office135 Hart Senate Office Building Washington DC 20510
Model
Directional: count only breaks toward the other partyWhy do scores change?v3default (selected)v2 model swing-v2
Signals to watch
What in this member’s state, record and ideology could move them, and in which direction. Their score is the same on every bill they haven’t committed to, so these are the things to watch.Could pull them toward Democrats · 2 signals
- StrongBacks 8 Democratic-led tracked billsSponsor or active cosponsor of 8 of the 865 tracked bills that were introduced by Democrats: S. 315, S. 567, S. 836, S. 865, S. 874 and 3 more.
- Medium5th most moderate of 53 Senate RepublicansDW-NOMINATE +0.363 vs. the Senate Republican median of +0.558: 0.195 toward the Democrats (rank 5 of 53 by distance toward the Democrats).
Keeps them with Republicans · 0 signals
None of our measures place this member firmly with their party.
Bill-specific inputsVotes on similar past bills and committee seats vary by bill, so they appear in the swing-v3 scores below rather than here.
Term and election
From the congress-legislators dataset- Current term
- January 3, 2023 – January 3, 2029
- Senate class
- Class 3
- Seniority
- Senior senator
- Next election
- November 7, 2028
- Years in office
- 51.7 years
Committees
Seats on a bill’s committee of referral add a in swing-v3- Senate Committee on the JudiciaryChairmanMajority · 1st in seniority
- Joint Committee on TaxationMajority · 2nd in seniority
- Senate Committee on Agriculture, Nutrition, and ForestryMajority · 9th in seniority
- Subcommittee on Commodities, Derivatives, Risk Management, and Trade
- Subcommittee on Rural Development, Energy, and Credit
Voting ideology
first dimension, from VoteviewR median
D median
Grassley← More liberal (−1)More conservative (+1) →
Their score of +0.363 is 0.20 to the left of the Senate Republican median (+0.558).
Advocacy scorecards
Their rating vs. the Senate Republican average- 119th Congress94Senate Republican average: 88 (n=53)
Swing score by bill
swing-v3, directional · a bill marks a member as committed to itShowing 1–50 of 845 tracked bills, best swing first
| Bill | Their role | Swing score · | |
|---|---|---|---|
| H.R. 4Rescissions Act of 2025Summary on Congress.gov | No position yetNow in the House | 79
| Swing |
| S.Con.Res. 33 |