After some advice please.
Im in MTT $5 rebuy, and there are 28 players left. Pays down to 20th. Im currently in 4th place with 38K in chips. blinds 500 - 1000.
I get dealt Ah

in mid position. I caller in front of me. I raise to 4K, and its gets re-raised to 20K by the (slight) chip leader.
What should i have done?