Freshmen US House Members who may be future US Senators.

AZ(Stanton-D) in 2020 or 2022 against McSally-R.
CO(Neguse-D/Crow-D) in 2020 against Gardner-R/2022 or 2028 if or when Bennet-D retires/2026 if Hickenlooper-D or Perlmutter-D retire after 1 term and Polis-D does not run for the US Senate in 2026 or 2028.
GA(McBath-D) in 2022 if or when Isakson-R retires.
ID(Fulcher-R) in 2020 if Risch-R retires or 2022 if Crapo-R retires.
IL(Casten-D or Underwood-D) in 2020 or 2026 if or when Durbin-D retires.
IA(Finkenauer-D or Axne-D) in 2020 against Ernst-R or 2022 when Grassley-R retires.
KS(Davids-D) in 2020.
ME(Golden-D) in 2020 against Collins or 2024 if or when King-I/D retires.
MD(Trone-D) in 2024 when Cardin-D retires.
MA(Trahan-D or Pressley-D) for Warren's-D seat in 2022 special or 2024 or for Markey's-D seat in 2020 or 2026.
MI(Slotkin-D or Stevens-D) in 2024 if or when Stabenow-D retires or 2026 if or when Peters-D retires.
MN(Craig-D or Phillips-D) for Klobuchar's-D seat in 2022 special or 2024.
NH(Pappas-D) in 2020 or 2026 if or when Shaheen-D retires.
NJ(Van Drew-D/Kim-D/Malinowski-D/Sherrell-D) for Booker's-D seat in 2022 special or for Menendez-D seat in 2024.
NM(Haaland-D or Torres Small-D) in 2020 or 2026 if or when Udall-D retires.
NY(Rose-D/Ocasio Cortes-D/Delgado-D) for Schumer's-D seat in 2022 or 2028 or for Gillibrand's-D seat in 2022 special or 2024.
NC(McCready-D) in 2020 against Tillis-R or 2022 for Burr's-D seat.
ND(Armstrong-R) in 2022 or 2028 if or when Hoeven-R retires.
OH(Gonzalez-R) or Brown's-D seat in 2024 or Portman's-R seat in 2022 or 2028.
OK(Horn-D) in 2020.
PA(Dean-D/Scanlon-D/Houlahan-D/Wild-D) in 2022 against Toomey-R or 2024 if or when Casey-D retires.
SC(Cunningham-D) in 2020.
WV(Miller-R) in 2024 against Manchin-D.