1. Democrats win the House (odds are good)
2. Democrats win the Senate (really tough, but small possibility)
3. House impeaches the popular-vote-losing Donald Trump and Mike Pence
4. House Speaker Nancy Pelosi, third-in-line, becomes president
We could actually make that happen. Obviously, hers would be a caretaker presidency, just holding down the fort until the American people got their say in 2020. But a caretaker would be far preferable to whatever the fuck Trump is, and a Democratic president would be in line with the wishes of the majority of the electorate. Not to mention, provide competence, and take the threat of nuclear annihilation off the map. Oh, and the Russians would lose their puppet.
So yes, we can make that happen, and we should work our asses to make it happen. Because President Nancy Pelosi sounds pretty good right about now.