Center-Left Socialists in Weimar Germany?

I'm looking for a list of non-authoritarian socialists in Wiemar germany to make the first president.

I'll worry about coming with the POD of getting him elected later, i'm just looking for a list or just one name of a socialist in germany in the late teens early twenties.

please and thank you.
 
Uhm, as far as I know the OTL first President fit. There was the events surrounding the Spartacist incident, I suppose, but that was a bad situation with few options available.
 
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