Actually what I'm really thinking will happen is...well, for one, 42 E could be going on faith alone that we'd elect Harvey Dent given our candidates, which is pretty fair--I think the majority of us would vote for him. I mean it's possible we could organize a massive movement to all vote for Worthington or Garcetti, but improbable, and in the unlikely event that it happened, they could always rig the election or, alternatively, since they're supposed to be in June (I think?) create an event that knocks out whichever candidate wins post-election.
It's also possible that Worthington and Garcetti (it really looks like Garcetti's not gonna make it to the election at this point, if we're right about the mob ties and, uh, I think we are) could end up dropping out of the race and Dent could win by default. There are still a lot of other measures to vote on, which is kind of exciting because even if they don't show in the movie, they'll probably inform some measure of the game.