[mosch]

Raises for value.

MP is on an especially wide range because he's out of chips. UTG will call the raise because the pot is big, and he is loose and bad.

And while you only have one pair, there's a decent chance that even if you don't beat MP, you're going to win the side pot with the loose-bad player who could easily have a high card flush draw, top pair, or some other nonsense. And if he happens to have two pair on that board, well you've got some outs to improve.

Oh, and if he re-raises again, it's not like it's a disaster. You're probably still ahead of his range.