But a battle over tax policy is not what is really animating the Democratic base. What really gets the progressive left is the chance to impeach the president and possibly remove him from office.
They don’t want to be a check on the president and his power. Instead, they want to nullify the election and install somebody more to their liking.
My own experience at using impeachment as a device to drive voters to the polls is that it doesn’t work. In the 1998 election, we promised to impeach Bill Clinton because he lied about his sex life, but that excited only the most partisan of the conservative base.
Most voters in 1998, and I think most voters in 2018, cared more about the growing economy than they cared about Washington parlor games. And that happens to fit in well with Republican messaging.