[jeffnc]

It doesn't matter what your cards are here, always call.

There are some situations where you might fold, but limping and then calling a single raise is never one of them.

If you limp, and there is a raise and then a reraise behind you, you will fold some hands.

A more subtle example is when you complete the SB (especially when the SB is large, e.g. a $10 blind in a $15/30 game). Let's say a late player limps, you limp for $5 more getting 8:1 on your money, the BB raises. Now you're out of position and getting worse odds, there are hands here you could fold.