Overcall this river?

[Jaran]

So, this table was sweet. Lots of cold calling, no matter how many bets, people calling down with bottom pair, a raise meant betting hard 'til the river, even with air. Really great table. Specific reads on the players in this hand: UTG seemed solid, just a tad loose pf, but played well post. MP2 was overaggressive pre and postflop, would bet 2nd pr/underpocket like the nuts. CO was your basic lpp, with a heavy emphasis on the loose part. My main question is about the river, but as always, I would appreciate comments on the rest of the hand.

-Jaran

Fulltilt Poker 9 handed
Hero is in MP1 with (A[img]/images/graemlins/diamond.gif[/img], J[img]/images/graemlins/club.gif[/img])
UTG calls, 1 fold, Hero raises, MP2 3bets, 1 fold, CO calls, 3 folds, UTG calls, Hero calls

Flop (13sb)
8[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/heart.gif[/img]
UTG checks, Hero checks, MP2 bets, CO calls, UTG calls, Hero calls

Turn (8 bb)
3[img]/images/graemlins/club.gif[/img]
UTG checks, Hero checks, MP2 bets, CO calls, UTG calls, Hero calls

River (12 bb)
A[img]/images/graemlins/heart.gif[/img]
UTG checks, Hero checks, MP2 bets, CO calls, UTG calls, Hero...