Can a VP nominee swing a battleground state in a presidential election. Not usually:
One of the persistent ideas regarding vice presidential selection holds that presidential nominees seek running mates from large, competitive states. Guided by that assumption, the Great Mentioners invariably include many politicians from such states on the lists of prospective vice presidential candidates that they compose every four years. The premise seems to be that a running mate can minimally, at best, affect the national election returns but that a popular favorite son or daughter may help swing an important electoral block. This conventional wisdom regarding vice presidential selection practice encounters one significant problem: It’s wrong.