WI: Herbert Hoover joins the Democratic Party

Herbert Hoover OTL considered joining the Democratic Party in 1920, but decided to join the Republican Party because he felt 1920 was "a Republican year".

So what would have happened if Herbert Hoover joined the Democratic Party, instead of staying with the Republican Party?
 
There will be no Democratic administrations until after the 1920s or following an economic crash. In the OTL, Hoover never held elected office and all his positions were appointed by Republican presidents. He will therefore need to chart a different course.
 
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