Romney has the least-impressive electoral history of any Republican frontrunner in a very long time. Most of the politicians who chase the White House are proven vote-getters with very few electoral blemishes on their record. John McCain, Mike Huckabee, Bill Clinton, John Kerry, George W. Bush, Bob Dole, Michael Dukakis—what unites all of these men is that before getting to the presidential level, they had demonstrated a talent for getting people to vote for them. (Barack Obama is the exception who proves the rule.) Over the years, Mitt Romney has faced voters in 22 contests. He won 5 of those...