Why would you say limp obviously?

Just asking because I think limping is a mistake...but am definitely open to my opinion being wrong. i realize AJs is a marginal hand, but with so many limpers in the pot, you gotta figure either CO and/or button will at least call, and that will force SB to complete and BB to check, if not raise. The odds are just too good to pass if everyone limps. I like to take the action to them and reduce the number in the hand while better defining the hands. Plus, that raise could force out the CO and button, giving you position on the table...if the hand was raised preflop, i pity the players facing the bet you will make post flop...i think you take it down there or have all ur chips in with TPTK praying it holds up