While the presidential horserace will consume much of the political media’s attention over the next year, muted Running Mate Match Game speculation is already underway. One figure that generates a disproportionate amount of discussion on this front is Sen. Marco Rubio (R-Fla.). Despite a series of public demurrals, Rubio-for-VP buzz is unlikely to dissipate any time soon. In Rubio, Republicans have a gifted politician, a very effective communicator, and someone who has earned near-universal admiration among conservatives. He also hails from a critical swing state, and could almost single-handedly put a coveted and growing demographic into play, virtually overnight. Rubio...