The latest allegation swirling around businessman Herman Cain — that he conducted a 13-year long extramarital affair with a woman named Ginger White — could well amount to a political death blow for his already-reeling presidential campaign. And that’s bad news for former Massachusetts governor Mitt Romney.

Romney has been the lone steady figure in the Republican presidential race, holding firm at between 20 and 25 percent in national primary polls.

Meanwhile, a parade of would-be rivals — Donald Trump, Minnesota Rep. Michele Bachmann, Texas Gov. Rick Perry and Cain — have risen rapidly and fallen just as quickly. Former House speaker Newt Gingrich is the latest to try to seize that mantle.

While the vast majority of the media coverage has focused on the ups and downs of the anti-Romney candidates, that glosses over the fact that the former Massachusetts governor hasn’t been able to win over large swaths of conservatives — remaining almost entirely stagnant for months.

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