“Liberal establishment is gearing up to support a primary run by a Democrat.”
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The last time a sitting Democrat president was not nominated for a second term we were rewarded with Tricky Dick, the first and only president to resign the office. I hope we don’t have anything resembling that to happen again.
LBJ was not challenged in the primary. He just didn't run. The last time a sitting Democrat President was challenged in the primary, he then lost to one Ronald Wilson Reagan.