Romney won't pick Newt. That'd be as foolish as picking Palin, probably even more so. The repup primary is a fight for right wingers- who would never vote anything other than repub.
The general is a fight for moderates- who can vote dem. Newt is not moderate and he pisses women off like no politician I have ever seen. Women votes are a problem for Romney, enter Ann's speeches and distance from the Newt.