I think the Pope would be good.
“White robes after Labor Day?! Puleeeease!”.
Fred Phelps, Jerry Falwell, Jimmy Swaggart, or John Hagee would also do well. Hagee needs to dress more weight appropriately and get some of that red carpet out of his church.
Otherwise: Bill Clinton would be a cool coup. while it’d be interesting to see if they could do the impossible and make Michael Moore look cute.
Ah-nuld would be entertaining.
Jack Black. Though not because I don’t like him; I adore him. 
Actually it’d be a really cool stunt for a political candidate looking to get some free publicity as well as some gay and young and liberal votes while not really pissing off the right wing.
Kid Rock.
it’s a cryin shame anna nicole isn’t a man…