Weird Limp ReRaise Hand (Party 10/20)

[cardsharkk04]

I've been at this table for 10 or 15 min. and have not played a hand yet. I get AsJs UTG and limp, a player who raises with a lot of marginal hands raises in MP to 65 and gets 3 callers. With my tight image I decided to reraise to 325 and the original raiser folds, but the other 3 call. WTF? Flop is AAK rainbow. Should I be happy? I kinda wanted a low flop to represent my overpair. Anyway I check and the first guy bets 300 into the $1300 pot. Not really sure what to do here, kind of an odd situation. I know not many of you would make the preflop reraise, but what would you do on the flop? All stacks are about 2k