I see PP's minraised alot at low-stakes tables. When I first read this I was thinking the guy had Aces. I see them minraised a lot.
preflop: yes a re-raise would probably be the best here. if you get called, you're looking at a small PP couple paint cards or even possibly a suited medium suited connector. if you get re-raised, it's hard not to put them on a big PP.. so you get info either way.
flop: the raise here definitely indicates that he's protecting against the flush. this spot is actually very nice for us.. i will sometimes pretend to hit the flush if i'm on a busted straight-draw or something and i know the bettor is afraid of the flush. anyway, we're pretty sure he doesn't want the flush.. so he's either got big pair, two-pair or a set
turn: all-in push right off the bat. with the two checks to him, he definitely thinks you're both on the flush draw. and with the flop call he thinks the only way to push you guys out of the hand is to all-in. well denissa was probably on the flush draw and he got her out. Now, the only hands he's scared of is AA and KK, and with no preflop re-raise those are pretty dang unlikely. So if he gets a call here you're either going to be drawing to a flush WAY against the odds
, or he has a almost assured win. but, of course you hit the 4 outer =P
Moral of the story, I would have folded at the turn all-in. Mainly because I had a feeling he was on a PP, and probably hit it on the flop. The only other hand I can see is AK and you'd split and it's not worth the all-in to find out if you're dominated or tied.
Oh and a side note on the turn. I definitely would have led out with a bet there, hitting 2-pair... you definitely aren't slowplaying in that spot are you? We have to be very worried about the set and a re-raise there would tell us for sure that's what's up. If it's a weak ace they're probably getting out of the way.