A Facebook Live video introducing Tuesday’s mid-term Congressional elections, setting out how they work, considering the possible outcomes, and explaining why they are the most important in modern US history:

1. What are the Elections?
2. Why Are They So Important?
3. What Are Possible Outcomes?
4. The Significance After November 6

The current state of the Senate election map, with Safe Democrat dark blue, Likely/Leaning Democrat light blue, Safe Republican dark red, Likely/Leaning Republican light red, Toss-Up gray: