One month before ballots are cast is not that time.
And neither is two months before ballots are cast, or three months before ballots are cast, and of course when it comes to the general election year is right out. The end result is that the time where you shouldn't criticise The Party becomes a nontrivial fraction of a person's whole life, and especially the politically significant portions of a person's life (given that "right before the election" would normally be a very good time to put a proverbial gun to the party's head). You're basically sacrificing a good chunk of democracy to protect the Democrats at that point.