I think folding is a little better in that spot. I don't like the call of the raise on the flop, and lots of times if you go for a check raise on the turn when the ace falls, you'll give your opponent a freebie. If I'm the button and I've got KQ, I'm probably checking that sucker. Bet the river, call if he raises. Unless he's a bonehead who'll bet 2 pair on the end if you check. Then check.