The Pledge to Safeguard the Election (https://sign.moveon.org/petitions/pledge-to-safeguard-the-election) demands that election officials abide by modern electoral processes or else threatens to effectively "primary" them in future elections if they don't (in the elections, not necessarily in the primaries themselves).
Yes, the Republican Party is terrified of Trump voters. But the pressure on the Republican Party shouldn't just be coming from Trump voters - it should be coming from the entire electorate (including Trump voters) to make them follow modern electoral procedures (which would basically lead to the popular will from within EACH STATE being expressed faithfully in the Electoral College). We should make Republicans terrified of something much larger than Donald Trump: that we - especially Independents and moderates - will "primary" them on this specific issue in future elections if they don't follow contemporary electoral procedures in the current one.
We must start thinking about how far we are going to let these activities to go on before we the people preempt the political class and street thugs from potentially hijacking this election.
Be proactive. A healthy democracy requires a proactive citizenry.