Charlie Baker/Condoleezza Rice!
That said, I think Huntsman, as a Trump supporter with foreign policy experience, Mia Love, Mary Fallin, or Joni Ernst would give the best credentials and balance to Baker.
Why do you think Condi would help the top of the ticket, I mean she would easily be tied to Iraq and Bush's foreign policy that she would bring the ticket down
Her popularity among the electorate, as well as the fact that she offers widespread appeals to both George W. Bush style "compassionate conservatives" due to her connection with his administration and more socially moderate Republicans.
