AHC FDR/Truman in 1940

There's numerous threads about what if Wallace had remained VP after the 1944 election and subsequently succeeded FDR.

So is there anyway that the then first term Senator from Missouri have got on the 1940 ticket ahead of Wallace? What changes could this have meant to aFdr's third term and the conduct of the War and to Truman's Presidency, assuming of course he gets nominated in 1944?
 
That's basically ASB. Truman was seen throughout most of his first term as the "Senator from Pendergast." Ignored by his colleagues and the WH. FDR did not support Truman in his primary against Gov. Stark, which Truman barely won through his own hard work plus a split in the ABT vote. So no chance Truman gets on the ticket in '40.
 

Cook

Banned
It was Truman’s chairmanship of a committee into waste and corruption in American rearmament that gave him a significant profile. As Beaver has pointed out, prior to that committee Truman was seen as the stooge for an extremely corrupt Missouri Democratic Party powerbroker.
 
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