AA against a maniac and an unknown in a big pot

[cab4656]

MP2 is a maniac. He is like 60/25 preflop and very aggressive postflop. He uses raises and check-raises and I strongly suspect he has pushed me out of at least one heads up pot with a worse hand.

My turn decision really had me puzzled. It seems like SB also has an overpair, but the maniac could have lots of things. I'm thinking it might have been better to coldcall here, in case the maniac has me beat and since I have very little to gain by making SB fold.

Party Poker 5/10 Hold'em (10 handed) converter

Preflop: Hero is CO with A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, UTG+1 calls, <font color="#666666">2 folds</font>, <font color="#CC3333">MP2 raises</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero 3-bets</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">SB caps</font>, <font color="#666666">1 fold</font>, UTG+1 folds, MP2 calls, Hero calls.

Flop: (14 SB) 9[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, MP2 calls, <font color="#CC3333">Hero raises</font>, <font color="#CC3333">SB 3-bets</font>, <font color="#CC3333">MP2 caps</font>, Hero calls, SB calls.

Turn: (13 BB) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">MP2 raises</font>, <font color="#CC3333">Hero 3-bets</font>, SB calls, <font color="#CC3333">MP2 caps</font>, Hero calls, SB calls.

River: (25 BB) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">MP2 bets</font>, Hero calls, SB calls.

Final Pot: 28 BB