[illini43]

A case can be made for raising this preflop to punish limpers.

Raising the flop to 600 is a better play for the reasons listed in the post above.

With all the action, it's hard to tell what kind of hand might be making this move. I think I call because this looks like a low buy-in tournament and lots of worse two pair combos have hit, but I can also see this being a gutshot like AT or T9 that hit. Someone could have been slowplaying a set...bleh, I probably push it in as well (i.e. push over to try and isolate the original raiser instead of calling - thus giving him better odds to stay in the pot).