2pair facing river shove on 50NL

[mAkCQRE]

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Calling this flop raise is spew in a multiway pot. Also, leading in this flop is not that great either as you allow the random junk 2pair/draw hands to build the pot and have position on you. As played fold the flop, assuming you don't, a check/raise all-in works best on the turn if you're looking for value. Honestly, against a nit like this his range is fairly evenly split between AT+ and a set.

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Why is the flop call spew? i get like 6:1 and the raiser is allin already.
I agree that leading the flop is at least questionable tho.
I lead the turn because i didnt expect CO to bet, he didnt show any agression in the hand yet.
His range: i didnt have AK, AQ, AJ in his range. pretty much AT, sets, A6 and A4 maybe.