That may or may not be, but second candidate with good numbers would have strong chances of getting a VP berth (for himself or a protégé). I don't see it as a conspiracy.
> Support for people who aren't likely to win the general election at least shows what issues are important to voters
Undoubtedly, but I think what Lessig is proving is that voters don't give a rat's ass about his issues. By continuing on this road I fear he's doing more harm than good to his cause. Even Nader's bid, which was much more realistic than Lessig's, did more harm than good to his movement in the long run.
> Supporting someone you disagree with more just because they're likely to win is truly "throwing your vote away"
The hard truth of First-Past-The-Post systems is that purism doesn't pay. A slightly-shaky alliance taking you to 40% trumps a purist core of 10% every day. That is an objective fact. It sucks, but you can't wish it away.