Thanks for the comments. At the time, I pretty much hated the way I played the hand up to this point, but in hindsight, I think I might have ended up playing the hand okay for the wrong reasons. I don't think you can fold jacks pre-flop there, especially in a relatively fast tournament (40 min. levels). It's either call or raise, and I think most people prefer raise. I prefer to call and see what develops. If you raise there, I think you are committed to the hand. Plus, if you call, you might just get the bluff money from AK on the flop and get them to lay down without seeing all 5 cards. Finally, it gives you an opportunity to get more info from the raiser on the flop.
When the two players called behind me, it changed the dynamic of the hand. Now when seat 3 leads out with a 3/4 pot bet, it's looking (to me) even more likely that he has an overpair to my jacks. Tough spot to try and run AK through 3 people. I folded. The button folded. Seat 1 immediately goes all-in. Seat 3 sighs, and rather quickly makes a reluctant call with what I'm sure is aces or kings. I'm patting myself on the back at this point. Of course, he has AKo. Seat 1 has pocket nines. Turn is a jack for an unneeded nut-kick.
On the very next hand I get pocket jacks again and raise to $600. Seat 3 goes all in for around $1500 total, and I call. He has A8o (the old Randy) and spikes an ace on the river. Shortly thereafter, I'm gone.