I will swim against the tide a bit - it won’t be Sarah, but I would not be surprised if it was a female. From a purely political standpoint it softens his image and removes the stupid female card from the equation.
However, I would not mind Gingrich getting the nod. He knows how to get things done in Congress and he was without a doubt the most effect GOP Congress critter of his generation.
Oops - effect should be effective.