Raise or Just Call?

[dennischambers]

Here's a predicament that came up the other day in my home game, .25/.50 BB with a $20 buy in (I know it should be bigger but we don't have big bankrolls). I had been playing for maybe 10 minutes and had been throwing away all my hands due to a punk who was short stacked at about $5 and just kept pushing and scooping the blinds. However, that was about to change. After he did his customary all-in (it was about the 3rd time he had done it and he had about $7), i looked down and picked up A-K. I was in early position, the game was 7 handed, and there were maybe 4 people left to call. I had about 20 dollars at this point, and everyone else had about the same amount. My question is, do i push over the top to isolate myself against a player who i know has a weak hand, or just call to get more people in the pot with my monster?
Thanks in advance,
Andrew