Why Romney deleted the line "He's a nice guy."

It was a stock line, but it meant something, and it's not something Romney wants to say anymore.

"[Romney] has said Obama's a nice fellow, he's just in over his head," [one campaign] adviser said. "But I think the governor himself believes this latest round of attacks that have impugned his integrity and accused him of being a felon go so far beyond that pale that he's really disappointed. He believes it's time to vet the president. He really hasn't been vetted; McCain didn't do it."

Indeed, facing what the candidate and his aides believe to be a series of surprisingly ruthless, unfounded, and unfair attacks from the Obama campaign on Romney's finances and business record, the Republican's campaign is now prepared to go eye for an eye in an intense, no-holds-barred act of political reprisal, said two Romney advisers who spoke on condition of anonymity. In the next chapter of Boston's pushback — which began last week when they began labeling Obama a "liar" — very little will be off-limits, from the president's youthful drug habit, to his ties to disgraced Chicago politicians.