A rare appearance on the campaign trail by President Obama on Sunday night was marred by a steady stream of crowd members leaving early and even a yelling heckler.
The president had shown up at the Democratic rally in Upper Marlboro, Maryland, near Washington, to support Lieutenant Governor Anthony Brown, who is running for governor.
With Obama's approval levels hovering around record lows, many candidates from his party have been wary of appearing with the president during their election races because of his sagging popularity.
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