Who Rob Portman votes with
Across 725 divided votes — ones where both sides drew a real bloc. Unanimous votes are excluded: everyone agrees with everyone on those, so counting them would measure attendance rather than agreement.
Most often with
| Member | Party | Agreement |
|---|---|---|
| Shelley Moore Capito | R | 86.8% (623/718) |
| Mike Rounds | R | 85.0% (497/585) |
| Todd Young | R | 82.6% (582/705) |
| John Cornyn | R | 81.5% (565/693) |
| Mitch McConnell | R | 81.5% (591/725) |
| Thom Tillis | R | 81.5% (559/686) |
| Chuck Grassley | R | 78.3% (568/725) |
| Roger F. Wicker | R | 78.2% (562/719) |
| Jerry Moran | R | 77.8% (522/671) |
| Bill Cassidy | R | 76.0% (537/707) |
| James E. Risch | R | 75.9% (526/693) |
| Mike Crapo | R | 75.5% (537/711) |
| Deb Fischer | R | 74.9% (539/720) |
| Kevin Cramer | R | 74.6% (487/653) |
| John Hoeven | R | 73.9% (518/701) |
| Joni Ernst | R | 73.9% (534/723) |
| John Thune | R | 73.6% (529/719) |
| John Barrasso | R | 73.4% (495/674) |
| Dan Sullivan | R | 73.0% (494/677) |
| Steve Daines | R | 72.6% (511/704) |
Least often with
| Member | Party | Agreement |
|---|---|---|
| Bernard Sanders | I | 28.2% (191/678) |
| Ben Ray Luján | D | 28.9% (193/667) |
| Tammy Duckworth | D | 30.6% (216/706) |
| Martin Heinrich | D | 30.6% (216/706) |
| Jeff Merkley | D | 30.6% (213/696) |
| Tammy Baldwin | D | 30.8% (220/715) |
| Patty Murray | D | 30.8% (220/714) |
| Ron Wyden | D | 30.9% (221/715) |
| Cory A. Booker | D | 31.0% (219/707) |
| Kirsten E. Gillibrand | D | 31.1% (223/717) |
| Elizabeth Warren | D | 31.1% (224/721) |
| Mazie K. Hirono | D | 31.2% (225/721) |
| Maria Cantwell | D | 31.2% (224/719) |
| Chris Van Hollen | D | 31.2% (215/688) |
| Sheldon Whitehouse | D | 31.4% (225/716) |
| Richard J. Durbin | D | 31.4% (227/723) |
| Christopher Murphy | D | 31.4% (222/708) |
| Edward J. Markey | D | 31.5% (226/717) |
| Alex Padilla | D | 31.5% (226/717) |
| Tina Smith | D | 31.6% (227/719) |
Only members with at least 20 comparable votes are listed. Agreement is not endorsement and not coordination — two members can vote the same way for opposite reasons, and the record almost never says why.