If you were building a Republican presidential candidate from a kit, imagine what pieces you might use: an athletic build, ramrod posture, Reaganesque hair, a charismatic speaking style and a crisp dark suit. You'd add a beautiful wife and family, a wildly successful business career and just enough executive government experience. You'd pour in some old GOP bromides - spending cuts and lower taxes - plus some new positions for 2008: anti-immigrant rhetoric and a focus on faith. Add it all up and you get Mitt Romney, a disquieting figure who sure looks like the next president and most surely...