[GaZaZaZa]

given that 3 people called a raise there is at least one a-2 out there, and it is quite likly that the CO has it, plus something else... given that the button is a moron, this is the perfect place to put in a decent raise, this could easily trap the button is he has anything semi-decent like a-2 or hopfully a-3 with some kinda two-pair/straight draw/flush draw. The other advantage of this is that the co being a good player he may fold his naked a-2 to a big raise leaving you alone with the button and hopfully taking his $300. ANd even if this makes the button fold, your hand beats the vast majority of hands that are out there so you dont even hate it if you go to war with the CO. In my opinion a decent raise here is the way to go.