[Bigwig]

That's a difficult one.

I just generally follow Sklansky's rule: If there is a limper, you need a [/i]better hand[/i] to raise with than you normally would.

So, I put my opponents on a slightly better range of hands, and adjust according.

This also depends on stack size. I'm much more apt to raise with something less powerful when I'm going all-in. And I'm much less likely to raise it all with deep stacks (~25+BB).