Semibluff KJ?

30/60

I haven't played limit in a few years so I feel a little sloppy.

I remember most of the players but the turn bettor is unknown. He is playing very loosely and passively pre flop. He has donked the flop 3 times. Twice he didn't show but lost. Once he did show and it was top pair A AQ. He is in the CO. He does seem to call down lightly although this seems more in HU situations than MW. He has several times called the river expecting to lose which he did. I've seen him bet the turn twice after flop checks then check the river and loose but no show. I saw him bet the turn once after the flop checked and he showed third pair but on a low board that clearly missed the PFR. I've only been at the table for an hour. I should have a TAG image.

A loose lady open limps UTG, folded to CO who over limps, I raise KsJc on the button and both blinds call.

6s7cTd...It gets checked around.

6s7cTdQc...It's checked to CO who bets. He's never folding a Q. He probably doesn't have a big hand since I would expect a flop donk. The Q hits my range but he is still betting. He could have picked up a draw. He might have a 6 or 7. There are still 3 other players in the hand.

Should I be raising this? Or should I just call and keep some customers in? I would hate to just call and he wins with a 6. I think he might call with a 6 and try to improve on the river but maybe not. Somebody else may have hit the Q and be going for a CR but might fold for two bets.