What if Hindenburg had never been elected President of Germany (1925)?

[rob in cal]

I've wondered about the 1925 election in terms of what would have happened if Germany had a proper runoff law where only the top two candidates advance into the last round. If this was the case, Thaelmann wouldn't have been in the second round, and while many communists would have boycotted, many would have supported Braun. (In my scenario only first round candidates go on to the second round).  Of course even if Jarres is elected, he would have been less likely to appoint Hitler in 1933 (assuming he's reelected in 1932).