>> “ Is it that Gingrich and Mark Levin once disagreed on something?” <<
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Its more like Grinchrich and Mark Levin disagree on just about everything Newt has done or supported.
More correctly, they disagreed on one thing: Gingrich's summary of Paul Ryan's Medicare proposal, but if you feel you need to lie to make your point, so be it. They agree on virtually everything else, and when they don't Levin takes Gingrich to task in the most entertaining way possible, because that is his job.