MP1 is 43/9 over a small sample, CO is 33/6 and a fish. There's been lots of 1BB preflop raising going on (which I'm seeing a lot of at the Party Monster tables) so I'm pretty sure MP1 has AK/overpair when he pops it to 4X. What's your line?

Party Poker No-Limit Hold'em, $ Hero (7 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

CO ($42.79)
Button ($296.20)
SB ($77.14)
Hero ($192.85)
UTG ($179.15)
MP1 ($100.65)
MP2 ($75.50)

Preflop: Hero is BB with 9, T. SB posts a blind of $0.50.
1 fold, MP1 raises to $4, 1 fold, CO calls $4, 2 folds, Hero calls $3.

Flop: ($12.50) 3, 8, J (3 players)
Hero checks, MP1 bets $7, CO calls $7, Hero ???