[Harv72b]

I raise this at 5/10 >50% of the time. On a theoretical level, I can see some reasons not to raise on 2/4:

-The limpers are far less likely to declare their hands/fold a better non-paired hand, even if you raise.
-It is more likely that one of the EP players limped in with a hand that has you dominated (KQ/KJ).
-You are less likely to buy the button by representing a big hand (i.e., one good enough to raise 2 limpers with).
-The raise is relatively less likely to get a player behind you to fold a weak/medium ace.
-It is less likely to be raised behind you when you limp behind.

On the flip side, I think it is more likely that you'll be coldcalled by a hand you dominate (i.e., QT/JT), and more likely that you'll be paid off when YHIG postflop.

FWIW, I tend to think that the potential negatives outweigh the potential positives here, at least when Hero is MP1 (whole different story if we're the CO or button). So I like limping behind & hoping for more limpers.