It would be foolish to assume that all of the Dems are 'in on the plot'.  Clearly, some of them are. Pelosi has been on-the-hook ever since that day her family entourage flights to EU was halted on the street by POTUS. She was forced to cave on the SOTU.  She was forced to cave, not the money, but president's right to build the wall.  She held off the impeachment squad every day for a year. NOW, she is playing her part again...basically by renaming the same efforts by all those committees under the umbrella of Impeachment.  She is giving the real dirty birds a shiny object to play with while, the White Hats gather around them. Pretty sure that she, and Schumer are 'under control'. In script parlance, this episode is the event that spins the action into the third act, where the final confrontation occurs.