Marc Thiessen: It's Pelosi vs. Ocasio-Cortez, Omar, Tlaib in the battle to control the Democratic Party

House Speaker Nancy Pelosi's, D-Calif., announcement that she is "not for impeachment" has caused resistance on the left. Pelosi is not trying to protect President Trump. She is trying to protect the Democratic Party from its lunatic fringe. It's an increasingly difficult challenge.

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