I personally think that US is currently at a stage where education and organizing are the most important tasks for the left. However, the fact that the right is increasingly seeing violence as the answer can't be ignored.

Furthermore, mainstream politics is incredibly polarized now with both republicans and democrats at the point where they see each other as a threat to their way of life. Whoever wins the election is going to be seen as an illegitimate tyrant by a large portion of the population. The whole social contract hinges on people accepting elections as being essentially fair. If people stop believing that the government holds power because it has the mandate of the people, then there's little reason to accept it.

Given all that, I expect that civil unrest is a very possible scenario after the election, and everyone should start preparing for that eventuality.