Worst Case and Best: Elections
From my point of view, the worst case election scenario is Republicans retaining control of House and Senate, while the best case is Democrats winning both. FiveThirtyEight, the stat masters, think the worst case is slightly more probably than my best, but that the intermediate case is distinctly more probable, with House and Senate going Dem and Pub respectively. Their stats predict that none of the three cases is very improbable, with odds of about 1 in 7 for the two extremes, that is to say more likely than a terrible NFL team beating a very good one.
So how bad could an abrupt slide into fascism be? Pretty damned bad.