A man clad in camouflage gave Republican presidential candidate Newt Gingrich some unconstructive criticism on Tuesday. While shaking Gingrich's hand at a grocery store in Iowa, the man told Gingrich he was "a fucking asshole." The former House Speaker responded by saying, "luckily it is a free country."

Watch video, clipped by Talking Points Memo, below:

Photo credit: Gage Skidmore