Hoover the Democrat

I've been reading the Year of Six Presidents by David Pietrusza. One of the interesting topics is Herbert Hoover's indecision over which party's nomination to pursue. He was touted as a potential successor to Wilson in 1920, and was even referred to by FDR as the finest possible nominee for the Democratic Party. However, due to the national climate and his conservative upbringing, he ultimately sought the Republican Nomination. Eight years later, he was elected President of the United States, only to preside over the first years of the Great Depression.

Is there some way that Hoover becomes a Democrat and is elected President? Several possible scenarios could be a Roosevelt Presidency in 1912 leading to 1920 being a better year for the Democrats, or Hoover simply running in 1920, losing the nomination and running again and winning in 1928. Any other ideas?
 
I was thinking a Hughes victory in 1916 is probably the best way to bring this about.
He'd have not long joined the Democrats by the time 1920 roles around, so getting him the nomination could be tricky (not necesarily impossible though given his popularity from World War I).
It'd be ironic if Hoover had the nomination and FDR was still the VP candidate.
Hughes winning in 1916 would probably lead to a democratic win 4 years later whatever I suspect, so if someone else is nominated Hoover could end up in a simelar role to the one he found himself in IOTL for the 1920's, making him the presumptive nominee come 1928.
 
If Hoover is nominated by the Democrats in 1920 (perhaps with Roosevelt as the VP nominee) the election would be closer, but not anywhere near close if Wilson has still been POTUS.
 
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