Mitt Romney may be leading in the polls, but his status as the GOP “frontrunner” is fragile at best. For all the talk of Romney’s “did-what-he-had-to-do” performance in the Republican presidential debate in New Hampshire, it’s widely accepted that the former Massachusetts governor is an uninspired choice for the GOP nomination. ... Historically, Republicans have nominated the runner-up from the previous election cycle, and Romney was the runner-up in 2008. But his second-place finish was exceedingly narrow — and in the end, closely contested. Once John McCain beat him in New Hampshire and South Carolina — after Mike Huckabee had...