latter stages, 55 in CO w/ limper

[elstunar]

I've been thinking about this hand from a 4/180 lately. My reads were button was calling lots of raises with marginal hands and thinks any top pair is da nutz and 2nd pair is damn good, BB hasn't been too out of line, and UTG has been a little loose. I feel my flop bet was pretty bad. I would like comments on what you think about preflop and then what about the flop? As played you fold to this flop raise?

PokerStars No-Limit Hold'em Tourney, Big Blind is t400 (7 handed) internettexasholdem.com

UTG (t16032)
MP1 (t13392)
MP2 (t8731)
Hero (t11420)
Button (t5413)
SB (t11184)
BB (t7854)

Preflop: Hero is CO with 5[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/club.gif[/img].
UTG calls t400, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to t1200</font>, Button calls t1200, <font color="#666666">1 fold</font>, BB calls t800, UTG calls t800.

Flop: (t4550) 6[img]/images/graemlins/heart.gif[/img], 7[img]/images/graemlins/heart.gif[/img], J[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, <font color="#CC3333">Hero bets t2000</font>, <font color="#CC3333">Button raises to t4000</font>, Hero ?

[Bakes]

limp pf, fold flop