What Political party will win in 2020?
Part of it depends on how long the GOP stands with the Trump train wreck.
I believe the opposite, if you're talking about the GOP politicians. I'm reading a LOT of conservatives that are saying that the RINOs are going to get voted out for new Republicans if they don't start backing DJT.
Trump's approval is going down. Some of the inquiries are looking like they are gaining traction. There is a "save your own seat" mentality.
The last I looked, his approval rating among those that voted for him has NOT gone down.
Not sure of your source but take a look at the very conservative Rasmussen presidential poll. This is in addition to members of the GOP who have publicly discussed impeachment as a possibility.