Condi's a horrible VP pick at this point, as she really isn't popular with the conservative base (both because she's black and because she's a Neo-Con). If Kasich wants a history-making running mate, he'd be better off with Nikki Haley, Joni Ernst or Kelly Ayotte.
Kasich's strengths as a candidate allow him to flip the Midwest (except for Minnesota).
Clinton narrowly carries Florida (but it easily is the closest state in the nation), and Castro's presence on the ticket allows her to narrowly take Texas.
Hillary Clinton/Julian Castro 49.6% 295 EV
John Kasich/Condi Rice 49.1% 243 EV