WI Huey Long lives, but doesn't become POTUS

Assuming that Huey Long isn't killed in 1935, where does life take him from there?

We know from OTL that Long prepared to run someone else against Roosevelt in the 1936 general election under the 'Share Our Wealth' ticket, and a few of the prominent names mentioned to be given that honor included William E. Borah (R-ID), Burton K. Wheeler (D-MT), and Governor Floyd Olson (FL-MN). Olson of course died before the general election happened as well, and with Long's death, the movement was taken over by white supremacist Gerald L.K. Smith, who formed the Union Party and ran William Lemke (who gathered around 2% of the national vote)

Assuming that Long lives, does this plan actually pan out? My instincts are that it does not, with Olson, the most likely contender for taking up such a ticket, dying as per OTL. If he doesn't die and does run on a 'Share Our Wealth' ticket, he might be able to flip a few states for himself in the midwest, but I really doubt that he'll do well enough to knock Roosevelt out in favor of Alf Landon. Long will probably skip the 1936 challenge and bide his time for the Presidential Election of 1940.

By that time rolls around, I can see Long becoming one of the more vocal anti-war, isolationist Democrats. He and Roosevelt were already on bad terms as it was, and Burton Wheeler wasn't, erm, the most charismatic man in the world, so Long jumping into the fray and becoming the mouthpiece of the isolationists on the left might be a good career move for him up until the war actually starts. Unlike Wheeler, he might be able to bring a challenge to the floor of the DNC against Roosevelt, though I really doubt it would be very successful.

Assuming that the war breaks out on schedule, what does Long busy himself with in the aftermath? How much longer do you see him sticking around in the Senate, and will he try to go for the top spot at some point in the future?
 
Not really. Though Long would only be 51 in 1945 he will be politically superannuated. Like other rural populists such as Wheeler, Borah, Hiram Johnson and Hendrik Shipstead, a man whose political prime was in the 1920s cannot survive in the postwar environment. Long's immune to the GOP because he represents the one-party South. Also- race. If an explicit, charismatic, young racist (George Wallace c. 1962) emerges to challenge him in the Democratic primary, then Long's finished. Long was far ahead of any Southern contemporary in predicting the demise of the Confederate-relic oligarchy that ruled the region, and they'll be gunning for him at the first chance available. As Wallace might put it: "Are you with us or with the n******!"
 
I honestly think the best chance Long could get at becoming POTUS, if he would have withdrew his support from Roosevelt at the '32 convention, causing a deadlock, and throw his support behind FDR in the last minute in exchange for the Vice Presidency. As we have soon, Long was really an asset on the campaign trail, but once in office he was far to unpredictable to control even as VP. So if we have a successful Zangara assassination, with Long as the VP Nominee...We would have Long as the nation's 32nd President.

I think 1940 could also be doable, because he only started his career as Governor of Lousiana in '28, so his rise to power was really metoric. I think if he doesn't get assassinated in 35, I think the Party Bosses will find something to push the Kingfish out of office. But since you couldn't succeed yourself in Gubernatorial elections in Lousiana at the time. All he has to do run for a second unconsecutive term of Governor in '32, while the SHOW ticekt performs nationally...thus setting him up for 1940,
 
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