In addition to my earlier message, I agree with J. Guy's suggestion about a possible weak CMOS. In order to test this possibility, you can follow this procedure:

1) Push the button and keep it pressed. Then, the P3.3 level is, as you said, 2.3 V.

2) Connect a 470 ohm resistor between P3.3 and ground. If the voltage is still 2.3 V, your uC is probably damaged. If near 0V, keep the button pressed and go to the 3rd step.

3) Disconnect the resistor. If the voltage remains now near 0V, then you have a weak CMOS problem.

BTW: Are you sure no AND-gate input is left unconnected?.

Alfredo.