Ajo on the button vs. calling stations

[Fathomer1977]

I think I got giddy eyed over the two calling station/donators.

Full Tilt Poker, $0.25/$0.50 Limit Hold'em Cash Game, 6 Players
LegoPoker Hand History Converter

Hero (BTN): 18.20 BB
SB: 20.60 BB
BB: 21 BB 55/1/1
UTG: 19.40 BB
MP: 44.60 BB
CO: 49.70 BB 53/1/1

Pre-Flop: A[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/club.gif[/img] dealt to Hero (BTN)
2 folds, CO calls, <font color="red">Hero raises</font>, SB folds, BB calls, CO calls
Bad spot raising Ajo vs two calling stations?

Flop: (6.4 SB) 9[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/spade.gif[/img] (3 Players)
BB checks, CO checks, <font color="red">Hero bets</font>, BB calls, CO calls

Turn: (4.7 BB) A[img]/images/graemlins/heart.gif[/img] (3 Players)
BB checks, <font color="red">CO bets</font>, Hero calls, BB calls
I'm bewildered as to why I called and did not fold or raise. Which would have been the better play? I'm almost positive that one, most likely CO, was playing a weak ace(limped pf, called flop, then bet ace)

River: (7.7 BB) K[img]/images/graemlins/diamond.gif[/img] (3 Players)
<font color="red">BB bets</font>, CO calls, Hero ?

I feel inclined to call but my gut tells me to me I'm beat.