I think either gets the nominations, they should make a place for the other in the inner circle but pick a young vibrant solidly Conservative VP and groom him to be President after they are done.
Someone like Paul Ryan or Rand Paul.
It will take more then 1 Presidency to complete the Tea Party revolution. A candidate for the future would be the very best legacy either Gingrich or Cain could give to the Conservative movement
Paul Ryan is needed in the House as Speaker to replace Boehner.