Christie's best choice would be Rep. Eric Cantor (R-VA). He comes from a key swing state, he has experience sufficient for the job, and he's Jewish. The GOP has missed some opportunities to make inroads in the pro-Democratic Jewish vote in a number of states.
Eric Cantor is very unpopular statewide in Virginia. That would be a very stupid pick.
And why would Hillary pick Mark Pryor? If she wanted to make inroads into Appalachia/Arkansas, it would be much better to pick the super popular Mike Beebe.