The New York times has this op-ed by former Vermont Governor Howard Dean, advocating instant runoff voting.
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This story says that Norman Solomon did a poll of the Sanders delegates to the July 2016 Democratic convention, and 33% of them plan to vote for Jill Stein. Only 37% say they will vote for Hillary Clinton.
On October 5, the only general election U.S. Senate debate in California this year took place. Because voters must vote for either Loretta Sanchez, or Kamala Harris (both Democrats), or not vote at all, obviously they were the only two candidates invited. Press reaction to the debate was virtually unanimous. See Joe Mathews’ commentary here. See the Calbuzz story here. It is titled “Kamala versus Loretta, the worst debate in history.” The CNN story is amusing and is here. Finally, here is a TIME news story.
According to this story, the Texas Tribune has invited Gary Johnson, Jill Stein, and Evan McMullin to debate. However, it appears the Texas Tribune did not set out any objective criteria for debate inclusion. Darrell Castle and Rocky De La Fuente are on the ballot in substantially more states than Evan McMullin is on. It is possible the Tribune has found a poll that includes all of those candidates, and it is possible McMullin polled above some level of support, and that Castle and De La Fuente were below that level of support. But it is doubtful such a poll exists.
The debate would violate FEC rules if it has no objective criteria.
The vice-presidential debate was held October 4, Tuesday evening. CNN had assembled a focus group of 28 individuals, who were on camera to discuss their reactions to the debate. CNN asked which way each member was leaning. Twelve of the 28 said they intend to vote for a third party or independent candidate for president. CNN had filmed that, but chose not to air it. Instead CNN re-shot that part of the interview and had them listed as “undecided.” See this summary of the incident at Reason.com. Thanks to Jack Dean for the link.