[adanthar]

First off, and most importantly, calling off half your stack PF (keeping in mind that you'll be getting around 4:1 on any flop and will even have to call a push) is terrible poker and you will wind up going broke this way a lot.

Second, you are really getting slightly under 2:1 on a push with a big side pot. It is a very safe bet CO has some kind of medium pair or worse, but that in all likelihood one or two of your outs are dead. Nevertheless, you're getting that 2:1 on a side pot with CO that you're over 2:1 to win and should probably push unless MP is very tight.

If CO had reraised, you would actually have an easy fold based on the updated read, but he's dumb and just called a pretty vulnerable hand, so there you go.