[steveyz]

Actually, I'll change my answer. After 4 limpers, I probably won't raise the medium pocket pairs (77-99, TT is borderline), as if the flop is rags, I'd like to keep the pot small, have someone bet into me so that I can raise and protect my vulnerable hand. Conversely, with the smaller pocket pairs, you can consider raising pf after a lot of limpers because there's basically 0 chance you can win without improving, so you don't have to worry about keeping the pot small or wanting someone to bet into you. Also, you can take a free card if they check to you, and if you do flop the set you can get a lot of customers as the pot is fairly big now.