To me Paul Ryan is the obvious choice and Bobby Jindal is the bold choice.
I would be delighted with either.
Agreed. Both are probably high on the list. My guess is Ryan is probably more likely because he might put Wisconsin in play. We are already likely to win Louisiana which makes Jindal less important.
Nikki Haley and Marco Rubio are both probably good options as well (especially Rubio). Some are saying Portman in Ohio, but he strikes me as a very uninspiring choice.