Alternate outcomes to the 1925 German presidential election?

I don't know much about Weimar politics, I admit, but it seems like 1925 is ripe with AH potential - what if the BVP backs the Zentrum's Wilhelm Marx instead of Hindenburg? What if the KPD's Thälmann drops out after the first round? (I guess either POD leads to the same result, doesn't it?) What would the consequences of Marx becoming president be? Could it butterfly away the rise of the Nazis or, perhaps, any far right party?

Alternatively, were there any realistic outcomes besides Marx and Hindenburg? Could Jarres or Braun have put together winning coalitions?
 
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