All of the pins on Port 2 do not have analog functionality.
Refer to the Cap Touch Booster pack docs at www.ti.com/lit/ug/slau337b/slau337b.pdf? where there is a very little note about this in section 3.2 that mentions something about this. You may only need to add resistors to make it work properly.
I have not tried this (only used Port 2 pins), so I would like to know if this solves your problem.
Wayne