Situation: about a third of a way through a three-table free on-line tournament; most of the maniacs have already been knocked out, and people are playing surprisingly seriously for a free tournament. I have an average stack of about 25 BB, and am in the BB, blinds 50-100.

Folded to loose cutoff with average stack, who calls. Button is chip leader, playing a lot of hands, and raises to 600. I have AKo. The last time I went all in I had AKs.

Do I raise all-in or just call?