A past Congress. The 115th Congress met from Jan. 3, 2017 to Jan. 3, 2019. Members are shown with the seat and party they held then; today's contact details, committees and caucuses aren't part of it.
115th Congress: sources and checks
This Congress's data was saved on Oct. 30, 2026 and doesn't change after that. Scores are computed from it the same way as the current Congress's (see “How we measure”). How we measure →
Voteview re-estimates DW-NOMINATE, the liberal-to-conservative scale, as new Congresses are added; the figures here are from the release downloaded on Oct. 30, 2026.
Checked against the official records
- House: 1,207 of 1,207 roll calls compared with the House Clerk's record of each one, member by member. 1 differ: 115-h310. 1 of them elected the Speaker; those are compared by who voted, since the votes are names.
- Senate: 264 of 599 roll calls compared with the tallies Congress.gov's bill records print. 8 differ: 115-s100, 115-s101, 115-s140, 115-s167, 115-s249, 115-s298, 115-s475, 115-s599. The Senate's own records couldn't be read automatically, and Congress.gov's bill records don't cover votes on nominations, so the other 335 weren't checked this way.
Six differ by one vote at Congress.gov because its tally includes the Vice President's tie-breaking vote; Voteview's lists senators only.
For 115-s140 and 115-s475 Congress.gov gives the tally after a senator changed her or his vote by consent (91-8 and 94-5, as in the Senate Daily Digest); Voteview's, used here, is the count before it (92-7 and 95-4).
House roll call 115-h310 was on the day Rep. Gianforte's term began: the Clerk's list doesn't include him, and Voteview counts him as not voting.
Votes with the President
Each member's score is the share of their votes that matched the President's public position, counted separately for each President, with missed votes left out. The positions follow the same rule as the current Congress's, set out on the main methodology page. Software matched the White House statements to votes, and every match was checked, with AI assistance (Claude) and no human editor, against the statement's text, the vote record and news coverage. How we measure →
President Obama: 1 vote. President's positions →
President Trump: 293 votes (183 nominations, 0 veto overrides, 97 White House statements on the bill, 13 other public statements). President's positions →
22 entries took a judgment call: a position applied to a procedural vote, a statement made more than 60 days before the vote, or a position added in the fact-check without a statement naming that exact vote. They're flagged on the positions page for sign-off by a named PCG editor, and they still count.
Voteview, the source of these roll calls, records the President's position on 289 of them. Of those, 280 agree with this site's list, 0 disagree and 9 have no position here.
Compared with CQ
CQ Roll Call publishes each year's average presidential support by party. The same average, computed here CQ's way (counting a member's missed votes against them), is shown beside it; the site's own scores leave missed votes out.
| Year | Chamber | Party | CQ | This site, CQ's way | Difference | Source |
|---|---|---|---|---|---|---|
| 2017 | House | Democrats | 16% | 14.1% | -1.9 | Roll Call, Feb. 15, 2018 (John T. Bennett) |
| 2017 | House | Republicans | 93% | 93.7% | +0.7 | Roll Call, Feb. 15, 2018 (John T. Bennett) |
| 2017 | Senate | Democrats | 37% | 36.8% | -0.2 | Roll Call, Feb. 15, 2018 (John T. Bennett) |
| 2017 | Senate | Republicans | 96% | 96.1% | +0.1 | Roll Call, Feb. 15, 2018 (John T. Bennett) |
| 2018 | House | Democrats | 31% | 30.1% | -0.9 | Roll Call, Feb. 28, 2019 (John T. Bennett) |
| 2018 | House | Republicans | 89% | 90.0% | +1.0 | Roll Call, Feb. 28, 2019 (John T. Bennett) |
| 2018 | Senate | Democrats | 37% | 36.7% | -0.3 | Roll Call, Feb. 28, 2019 (John T. Bennett) |
| 2018 | Senate | Republicans | 93% | 92.6% | -0.4 | Roll Call, Feb. 28, 2019 (John T. Bennett) |
Only Trump's positions are compared: CQ's 2017 is his, and Obama's position in January 2017 is shown separately. CQ counted 36 House and 117 Senate position votes in 2017 and 107 in the Senate in 2018; this site has 41, 117 and 104.
Party loyalty for 2017–2018 isn't compared with CQ's party-unity averages; it's computed from Voteview's records the same way as the current Congress's.
Sources
Not part of this Congress's pages
Committees, member caucuses, contact details and district maps are today's, so they aren't shown here. Neither are presidential election results by district, so a member's score isn't compared with what their district's vote would predict.