Olympia Snowe will not run for reelection. She made noises about the horrors of partisanship in the current Senate. She is a "moderate" Republican, which means she laments having to vote for bat-shit crazy legislation even as she votes for it. Snowe, I would venture, is known to nearly no one outside of Maine except for news and politics junkies. America Elect is a doomed attempt at electing someone as a third party candidate who holds Democratic Party policy positions. Using his acute skills, Jon Chait, who once wrote about how Trump was a real candidate for President, thinks, if that's the word I want, that Snowe is cleverly positioning herself for a run on the AE ticket.
I really doubt that that small state and unknown senator would quit a life-time sinecure for the opportunity to make an ass of herself. But who knows, maybe all evidence to the contrary Chait knows something.