NL25 - How far should we go with AK?

[tedmondh]

Poker Stars - No Limit Hold'em Cash Game - $0.10/$0.25 Blinds - 5 Players - (LegoPoker Hand History Converter)

SB: $13.45
BB: $12.75
UTG: $63.70
CO: $21.90
Hero (BTN): $25.30

Preflop: Hero is dealt K[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/diamond.gif[/img] (5 Players)
UTG folds, <font color="red">CO raises to $0.75</font>, <font color="red">Hero raises to $3.00</font>, 2 folds, CO calls $2.25

Flop: ($6.35) T[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/heart.gif[/img] (2 Players)
CO checks, <font color="red">Hero bets $3.75</font>, <font color="red">CO raises to $8.00</font> Hero?

Villian is a standard TAG. What can we interpret the flop raise as? We don't beat Villian's range often enough to continue, do we?