Gov. Mitt Romney's choice of Rep. Paul Ryan as his running mate is one of those decisions that seem obvious — if not inevitable — in retrospect, though it was by no means obvious to most of us beforehand. To get a quick sense of who Ryan is, watch a short video of a February 2010 meeting in which Ryan politely, but devastatingly, "schools" Obama on the fraudulence of the statistics the Obama administration used to claim that ObamaCare would reduce the deficit. That video is available on the Drudge Report. As a long-time member, and now chairman, of the...