2018 and 2020 US Senate Election- Democrats guide to 60 seats.
2018
Democrats have to hold onto every vulnerable Democratic seats(FL,IN,MO,MT,ND,OH,and WV) and potentially vulnerable Democratic seats(MI,PA,and WI) and pickup vulnerable Republican Seats(AZ,MS-special,NV,TN,and TX)+5D 54D 46R
2020
Democrats have to hold onto every vulnerable Democratic seats(AL,MS if Democrats win in 2018 special) and potentially vulnerable Democratic seats in (MI,MN,NH,and VA) and pickup vulnerable Republican Seats in
AK(Sullivan-R) Berkowitz-D
CO(Gardner-R) Hickenlooper-D/Perlmutter-D or Kennedy-D/Polis-D(whoever loses in the Democratic Primary for 2018 Colorado Governors Race)
GA(Perdue-R) Carter-D/Nunn-D or Abrams-D/Evans-D(whoever loses in the Democratic Primary for 2018 Georgia Governors Race)
IA(Ernst-R) Vilsack-D/Loebsack-D or Boulton-D/Hubbell-D(whoever loses in the Democratic Primary for 2018 Iowa Governors Race)
MT(Daines-R) Bullock-D
NC(Tillis-R) Foxx-D/Stein-D
If Democrats don't win MS special,TN,and TX in 2018
KY(McConnell-R) Beshear-D/McGrath-D
LA(Cassidy-R) Landrieu-D
TX(Cornyn-R) Castro-D
Democrats could win AZ Special and ME in 2020 if Collins(R-ME) retires or loses in the Republican primary.