Jason Zengerle pulls back the curtain:
Fehrnstrom, 50, is both the wise man and the hothead. He wears the uniform of the modern political consultant—iPad tucked in the crook of his arm, open-collared shirt, rectangular-framed glasses—but his fleshy face and thick New England accent betray a rougher core. And far from reining in Romney, he performs the opposite service for his client: Fehrnstrom toughens him up. "Eric gives Mitt a capability that Mitt doesn't have," says Ben Coes, Romney's campaign manager in 2002. "It's a streetwise savvy; it's an on-the-ground Boston-smarts mentality; it's a back-alley-politics, survival-of-the-fittest point of view. Mitt is not a knife fighter. Eric is a knife fighter." The best political operatives are the ones who provide their clients with a tangible quality the candidate himself lacks. If Karl Rove was Bush's brain, then Fehrnstrom is Romney's balls.