77 preflop decision against short stack pushes.

[Maier]

2-4 6 handed on fulltilt. EP has 50 dollars left and is going in with any two broadway cards. MP is really bad and will call a lot of raises with two broadway and has 130 behind. MP+1 is a tight player, havent seen him make any moves and has shown down good cards, has 120 behind.

Hero is UTG with 77. Hero calls with 77 and has 700 behind.
EP moves in for 50, MP and MP+1 both call rather quickly. Without thinking, should my best move +ev wise be to push both players in preflop? Would calling and pushing any board without an AK be acceptable as well?

For argument sake, what if they (MP MP+1) had 200 behind. Is this a call or push, or does this decision become more player dependent. What are my numbers against AK and K9? am I 36 percent to win this? Against three random hands, is my EV so marginal that it becomes a fold in the event that one of them does have 8s or better?