They just keep on moving the football down the field....
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Republicans never push back so naturally the Dems keep ratcheting up their tactics to ever more outrageous stunts. They have no reason to respect or fear the GOP.
Its just not in them to stand up for anything. They have no convictions. They are professional politicians who lie, dissemble and betray their voters. Whatever it takes to keep their seats.
Beyond that, they don’t care.
McConnell is only Majority Leader because he is a weak leader who gives progressive Republicans free range to roam. Contrast that to the Democrats who vote party line on all the big issues: tax cuts, obamacare repeal, etc.