A3 2 pair vs. gross board

[z28dreams]

Full Tilt Poker, $0.10/$0.25 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

Hero (BB): $24.65
UTG: $25.60
MP: $32
CO: $9
BTN: $7.20
SB: $49

Pre-Flop: A[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] dealt to Hero (BB)
2 folds, CO calls $0.25, BTN folds, SB calls $0.15, Hero checks

Flop: ($0.75) A[img]/images/graemlins/spade.gif[/img] J[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/heart.gif[/img] (3 Players)
<font color="red">SB bets $0.25</font>, <font color="red">Hero raises to $1.50</font>, CO calls $1.50, SB folds

Turn: ($4) Q[img]/images/graemlins/heart.gif[/img] (2 Players)
<font color="red">Hero bets $2.50</font>, CO calls $2.50

River: ($9) K[img]/images/graemlins/heart.gif[/img] (2 Players)
Hero checks, <font color="red">CO bets $1.50</font>, Hero calls out of spite?

So I'm really only ahead of like A2-A9 here... is it even worth calling this river bet?

Who leads the turn?