The GOP lost a lot of state houses in 2018 and are gonna lose more in 2020 as they follow Trump into disaster, the census and redistricting are up for grabs then I believe. Also if the democrats win they will be passing H.R.-1 that will remove many of the republicans unfair electoral advantages including gerrymandering. This series of unfolding scandals and court cases will go on for years if the democrats win and it will tar the republicans with the brush of treason for a long time. Many who vote against Trump will vote democrat right down the ballot from senator to dog catcher.
Unless the Russians/Trump's foreign army of online trolls whipped up women to such a degree with the help of Trump's horrible comments being amplified so much to get them out to vote, to be able to push how much women came out in 2018 to get the dumb ass men all riled up in 2020.
As much as I like AOC, and Omar, it is too much of a coincidence for me to think that the Russians didn't push them over the top to use as propaganda pieces.
tbh I am not really worried about any large scale attacks from the racists or Trump-tards. Not that some won't go crazy enough to do some major damage here or there, but once people see it happen, any good will they have will disappear fast, just like when white people had to watch the horrors of the racist suppression of black people on TV in the 60's.
Humanity is fucked up, but mostly we get it right.