If a person is stupid enough to believe that they have to be ideologically pure, that being moderate makes no sense to them, then perhaps they think if they're liberal about sexuality issues, then they've gotta be liberal about everything.
That pimp in Nevada who won a state legislative race despite dying a few weeks before the election was running as a Republican (which is how he won in the first place - the district he was running in was so red it would rather - and did - elect a dead Republican over a living Democrat).
I take it you haven't heard about the US Senate election in Missouri, in which Democrat Mel Carnahan, who died in a plane crash a few weeks before the election, defeated incumbent Republican John Ashcroft?