Walter Shapiro @MrWalterShapiro
I can't recall a protest candidate who had the total uncritical loyalty of 15-20 percent of his party, but no opportunity to grow. Closest analogue actually was Jesse Jackson in 1988, — PolitiTweet.org
Nate Silver @NateSilver538
There have been some candidates like this I suppose, but they're protest candidates who aren't really running to win.