Ohio, Iowa, Wisconsin, Nevada, Colorado, and Florida.
WI has not gone Rep since 1984. No way Reps win this one.
CO is trending blue. Possible
IA has gone Dem 6 out of the last 7 elections. Doubtful.
OH has gone Dem 4 out of the last six elections. Still in play.
FL has gone Dem 3 out of the last 5. In play.
If the Reps win FL, OH, and CO, they will have 56 electoral votes, not enough for the WH.