The most to least vulnerable Democratic held US Senate seats up for re-election in 2024.

WV(Manchin-D)
MT(Tester-D)
OH(Brown-D)
AZ(Sinema-D or Gallego-D)
MI(Stabenow-D)
NV(Rosen-D)
WI(Baldwin-D)
ME(King-I)
PA(Casey-D)
VA(Kaine-D)
NJ(Menendez-D)
NM(Heinrich-D)
WA(Cantwell-D)
CT(Murphy-D)
MN(Klobuchar-D)
DE(Carper-D)
NY(Gillibrand-D)
MA(Warren-D)
CA(OPEN Feinstein-D)
RI(Whitehouse-D)
MD(Cardin-D)
VT(Sanders-I)
HI(Hirono-D)

The most vulnerable Republican held US Senate seats up for re-election in 2024.
TX(Cruz-R) if the Democratic nominee is Julian Castro or Scott Kelly.
MS(Wicker-R) if the Democratic nominee is Jim Hood-D.(Jim Hood served 4 terms as MS State Attorney General, Ran for Governor of MS in 2019/lost in the November General Election to then Lt Governor Tate Reeves by a 5 percent margin.
IN(OPEN Braun-R) If the Democratic nominee is Frank Mvran-D.