Full Tilt $10+1 Midnight Madness

Blinds 30/60

Me - BB - 2,820 after posting - [Kh]
MP2 - 2,455 at start of hand - no read
Button - 670 at start of hand - fish - has been in every hand almost, betting into raisers with middle pair and then pushing when another OC hits the turn.

MP2 open-raises to 180, Button calls leaving him with w/ 490.

What's my move - call or raise - and why?

You're eliminating the possiblity that MP2's raise is dead money. He opened from a fair stealing position. You could very well have the best hand and you should apply the pressure on him if he wants to take a flop with QJ, A6s, or some crap like that and isolate the shorty. I might be inclined to just put 1000 in here and call a push.