Current TV correspondent David Shuster on Sunday joked that John Sununu “hasn’t taken his medication” because the former New Hampshire governor told a CNN host to “put an Obama bumper sticker on your forehead.”

During an interview on CNN last week, Sununu, who chairs presumptive Republican presidential nominee Mitt Romney’s national steering committee, had lashed out a host Soledad O’Brien after she tried to fact check Republican claims about Rep. Paul Ryan’s (R-WI) plan to overhaul Medicare.

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“Soledad, stop this!” Sununu shouted. “All you’re doing is mimicking the stuff that comes out of the White House and gets repeated on the Democratic blog boards out there.”

“I’m telling you what Factcheck.com tells you, I’m telling you what the CBO tells you, I’m telling you what CNN’s independent analysis says,” the CNN host explained.

“Put an Obama bumper sticker on your forehead when you do this!” the frustrated surrogate shot back.

On Sunday, CNN’s Howard Kurtz noted that others in the Romney campaign and at Fox News had also accused the “liberal media” of covering Ryan unfairly.

“John Sununu seems like some who hasn’t taken his medication and can’t hear very well,” Shuster quipped. “And if that’s the message that the Romney campaign wants, if that’s the kind of surrogate, keep putting him out there.”

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“I think the problem that a lot of journalists have had in trying to figure out where Romney’s position is, is Mitt Romney,” he continued. “Because on the one hand, one day he’ll say, ‘Oh yeah, I support the Paul Ryan budget.’ On the next day, ‘Well, I have my own plan for Medicare.’ On the next day, ‘But I support his budget plan.’ And the next day, reporters say, ‘What are the details?’ [And Romney says,] ‘Well, we’re not going to tell you until after the election.'”

Watch this video from CNN’s Reliable Sources, broadcast Aug. 19, 2012.