Strange 77 hand against donkish bettor

[Alpha13]

I didn't know what to think of this one. the way he bet suggested he may have a T or K but the bets were so small. How do you guys play it?

Party Poker (9 handed) converter

Preflop: Hero is Button with 7[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/heart.gif[/img].
<font color="#666666">5 folds</font>, Mp calls, Hero calls, sb completes, BB checks.

Flop: T[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
SB checks, BB checks, MP bets .75, Hero raises to $2, SB folds, BB folds.

Turn: K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
MP bets .35, hero calls

River: K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
MP bets .50, hero calls

Final Pot: