Herman Cain leaving the campaign trail: Why now? Herman Cain is surging in popularity in a number of polls. So why is Herman Cain putting his campaign on hold for the next month? The Hermantor Experience is, by almost any measure, the hottest thing going in the GOP presidential primary (not named Chris Christie). < snip> But Cain seems destined to squander it. And here’s why. As NBC’s thoughtful First Read points out this morning, Cain's promoting a book - and appears to be taking himself off the campaign trail for almost a month. Cain won’t be back in the...