Wow, so you not only think that she is running but will also get the nomination? Whew. That would involve some serious cat-fights along the way.
As much as I would like, Bernie won't get the nomination. He's just in so he has a voice in the platform. There are probably a whole bunch doing it for the same reason.
It would be dumb to let her run again, but you think trump has net gained or lost support since 2016?
I believe that Trump has lost support since 2016. however it should be noted that at this time in their presidency (the mid-term) most presidents lose support from two years earlier. Usually their support rises again as the next election approaches, and they also have the advantage of incumbency.