Good time to isolate/sandwich?

$5 tourney on stars
blinds are 10/20, hero's stack: 3k, average stack: 1700
1 limper from mp
hero raises to 100 from hijack seat with AQo
CO who has just said "it is time for a come back" pushes for 300 more (400 total).
Button, SB, BB, and limper all call. All callers have stacks 1200-1800

Hero pushes?

I would not be suprised to get 3-4 callers doing that, and with that much action wouldn't be suprised if one or more of them has AK.