Here's what it would take for Elon Musk to launch a third-party effort to represent what he called "the 80% in the middle."

WHITE: The Trump coalition is beginning to fracture, and in a lot of ways, there is historical precedent for this. Trump and Grover Cleveland have a lot in common besides serving non-contiguous terms as president.

Elon Musk has the money and, at least for the moment, the motivation to steer America's politics away from its two dominant parties. But long-standing obstacles to third parties, as well as Musk's own unique profile,