Wilkie's counterfactual Veep for re-election would probably lead the ticket and might be in so much disarray that the Dems take the election in 1944, which would probably mean Harry Truman.
It wouldn't be Truman. OTL, he was FDR's compromise. The party preferred James Byrnes, who became FDR's OTL Secretary of State. (Could be Truman becomes Byrnes' VP.) Byrnes as Pres is
scary. He was the one who wanted the Bomb used against Japan, & wanted to use it to intimidate the Soviets. He might just have agreed when LeMay suggested using it...
e the USA is run by a provisional leader is likely to be a problem--that would be October 1944, and that's a bad time to worry about a succession problem.
Does this end up with Japan having an actual chance of achieving their OTL aim, a negotiated end to the war?
Landon would also do a good job as president--he was an interventionalist and also wanted the USA to recognize Communist China's government, a move that would have undermined the cold war considerably. Landon opposed lend-lease and called to outright gift the UK $5 Billion.
Do you picture him surplussing off U.S. equipment? As I understand it, the Pres can do it on his own authority, & designate where it goes. He could, for instance, release USN DDs, without the actual Destroyers for Bases deal. There were about 125 old WW1-vintage 4-pipers,
Wickes/
Clemson & other classes, RN was in desperate need of. A handful of these (10? 20?) could've gone to Canada. RCN escorted over half
the Atlantic convoys, mostly the slow ones which were at most risk,
without having DDs able to catch up if they made contact with U-boats.
Even a handful to RCN would've cut losses in these convoys significantly. Also, he could release the 48 or so antique S-boats (WW1-era subs), which RCN/RN could've used as ASW training targets (which they were extremely short on), or even as operational boats for North Sea or Med, where their short range wouldn't have been an issue. (This would've freed RN T-boats, OTL in Med, for service in the Pacific. See Operation Compass Succeeds thread for potential effects.) Some might have ended up in Free French or Free Polish hands... And he might've released thousands of '03 Springfields & millions of rounds of .30-'06 ammo, & increased production of the M1 Garand to replace them. To replace the DDs & subs, he might also, as early as 1939-40, have boosted construction, which would've left USN in far better shape when Japan attacked...