still lose from those states, sorry
I really need to get to bed, so no time to do a county breakdown, but giving those four states to Democrats makes it 411 (R)-120 (D), down from 442(R)-89(D). Hey, Nixon can't run in 1960, so I still expect President JFK if it helps...
If Korea stays cold, then Truman has only Mcarthy's red baiting, mob investigations (not into him; but into usually Democratic machines in big cities) as far as I know, so I expect a 2nd New Deal, with little political capital to buy it. At the OTL DNC, Truman could not win, but he helped swing votes to the winner. here, he might pull a 1948.