(ABC NEWS) Some of Mitt Romney’s best moments on the 2012 campaign trail have come during town hall meetings when the candidate, long criticized as too uptight on the stump, strays off script to take questions from voters.

But the freewheeling nature of voter forums can have its drawbacks. Romney has faced hostile questions on everything from his wealth to his religion. And on Monday, he experienced another awkward moment, when a supporter stood and declared that President Barack Obama should be “tried for treason.”

The comment came during a town hall meeting in Cleveland. Taking the microphone, a woman told Romney that Obama had been “operating outside the structure of our Constitution.” Pausing after her question, she remarked to another member of the audience, “I agree, he should be tried for treason.”

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