MIAMI/SARASOTA, Fla. - Taking a more aggressive tack after a series of reversals, Republican presidential challenger Mitt Romney accused US President Barack Obama on Thursday of "surrendering" in his attempt to change up Washington.

A comment that Obama made in an interview with the Spanish-language television network Univision in Florida gave Romney an opening to charge that the president is ineffective.

Obama told Univision his 2010 US healthcare overhaul was a result of Americans exerting pressure on Washington for action.

"You can't change Washington from the inside, you can only change Washington from the outside," he said. "That's how the big accomplishments like healthcare got done, because we mobilized the American people to speak out."

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