Though the transcript did not remotely justify the advanced billing of a "quid pro quo," Pelosi set in motion a process that is already producing a sea change in the politics of 2020.

The great Beltway battle for the balance of this year, and perhaps next, will be over whether the Democrats can effect a coup against a president many of them have never recognized as legitimate and have sought to bring down since before he took the oath of office.

Pelosi on Tuesday started this rock rolling down the hill.

She has made impeachment, which did not even come up in the last Democratic debate, the issue of 2020. She has foreclosed bipartisan compromise on gun control, the cost of prescription drugs and infrastructure. She has just put her own and her party's fate and future on the line.