At Kos, they're saying: "Michigan, do you want this primary season to be over? Or do you want this primary season to be... hilarious?" The trouble with hilarity is you never know if you're going to get the last laugh.
Matt Yglesias has an interesting comment:
[C]ynicism aside, it really does seem to me that Romney would be a less dangerous president than Mike Huckabee or John McCain or Rudy Giuliani. Voting for Romney in a primary is win-win.
So have your fun, and if he ends up President... enjoy that too.