I've worked out how to do it first try:
Organise women with Juchacz
Political Rally on various issues
2x campaigning with workers (needs some luck)
Fund a radio station
PaulLevi
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Social Democracy: An Alternate History comments · Replied to AshySlashy9725 in Social Democracy: An Alternate History comments
I've tried doing this several times, but haven't gotten it, not sure if the order I did it was wrong or something.
That being said I keep on getting 33%, so my trick is to just make Müller chancellor, call a snap election as soon as I form a Grand Coalition, after which I campaign 2-3 times, then I can form the Weimar Coalition.