66 OTB w/1 MP1 limper - Raise or Fold?

[Sasnak]

MP1 is kind of loose passive and haven't seen much from him lately. The SB is a definite Rock and BB has been loose and fast.

Party Poker 1/2 Hold'em (10 handed) converter

Preflop: Hero is Button with 6[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/spade.gif[/img].
<font color="#666666">3 folds</font>, MP1 calls, <font color="#666666">3 folds</font>, Hero???