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During a stop in Portland, Ore., on Tuesday evening, Mr. Obama accused Mr. Romney of “twisting my words to say I don’t support small businesses” and argued that his opponent’s campaign is overplaying its hand.

“These are the games that are played in campaigns,” Mr. Obama said, “although I have to say when people start omitting whole sentences, they may have tipped a little bit over their skis. They may have gone over the edge.”

He also said he believes “with all his heart” that American entrepreneurs’ “drive” and “ingenuity” lead to their success. “The ability for somebody who’s willing to work hard, put in their sweat and their sacrifice to turn their idea into a profitable business, that’s the nature of America. We prize that,” he said.