AK(Sullivan-R) Democratic Nominee is Al Gross who is running as an Independent.
AR(Cotton-R) Democratic Nominee is Dan Whitfield who is running as an Independent.
ID(Risch-R) Democratic Nominee is unknown.
LA(Cassidy-R) Democratic Nominee is Antoine Pierce who is unknown. Mitch Landrieu-D keeps the race competitive but he is unlikely to run.
NE(Sasse-R) Democratic Nominee is Chris Janicek who is unknown.
OK(Inhofe or Pruitt-R) Brad Henry-D keeps the race competitive but he is unlikely to run.
SD(Rounds-R) Democratic Nominee Dan Ahlers is unknown.
TN(OPEN Alexander-R) Is James Mackler-D a stronger or weaker candidate than Phil Bredensen, the 2018 Democratic Nominee?
WY(OPEN Enzi-R) Dave Freudenthal-D keeps the race competitive but he is unlikely to run.
Longshot Republican held US Senate seats up in 2020 likely to go Democratic.
KY(McConnell-R vs McGrath-D)
MS(Hyde Smith-R vs Espy-D)
MT(Daines-R vs Collins-D) Collins-D needs to rely on 2020 Democratic Nominee for MT Governor Mike Cooney's coattails and Tester's help.
SC(Graham-R vs Harrison-D)
TX(Cornyn-R vs Hegar-D or West-D)
WV(Moore Capito-R vs Ojeda-D)