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Results of a Public Policy Polling survey of likely Michigan voters released Tuesday show the president ahead 51 percent to 44 percent. Only 45 percent of respondents said they have a favorable opinion of Mr. Romney, while 49 percent hold an unfavorable one.

Michigan’s electorate also doesn’t accept Mr. Romney — a former Massachusetts governor who has lived in the Bay State for decades — as one of their own, as only 34 percent consider him to be a Michigander to 57 percent who don’t.

Michigan is a Democratic-leaning state but one Mr. Romney hopes to win in November.

From wire dispatches and staff reports