These are the 33 Senate seats up for election in 2020.
20 (likely 21) of the 33 are Republican held seats.
Alabama Doug Jones Democratic
Alaska Dan Sullivan Republican
Arkansas Tom Cotton Republican
Colorado Cory Gardner Republican
Delaware Chris Coons Democratic
Georgia David Perdue Republican
Idaho Jim Risch Republican
Illinois Dick Durbin Democratic
Iowa Joni Ernst Republican
Kansas Pat Roberts Republican
Kentucky Mitch McConnell Republican
Louisiana Bill Cassidy Republican
Maine Susan Collins Republican
Massachusetts Ed Markey Democratic
Michigan Gary Peters Democratic
Minnesota Tina Smith Democratic
Mississippi TBD (2018 Special Election)
Montana Steve Daines Republican
Nebraska Ben Sasse Republican
New Hampshire Jeanne Shaheen Democratic
New Jersey Cory Booker Democratic
New Mexico Tom Udall Democratic
North Carolina Thom Tillis Republican
Oklahoma Jim Inhofe Republican
Oregon Jeff Merkley Democratic
Rhode Island Jack Reed Democratic
South Carolina Lindsey Graham Republican
South Dakota Mike Rounds Republican
Tennessee Lamar Alexander Republican
Texas John Cornyn Republican
Virginia Mark Warner Democratic
West Virginia Shelley Moore Capito Republican
Wyoming Mike Enzi Republican