What's the appeal of fusion voting exactly?
So people can vote for severely conservative Republican governor Mitt Romney on the Conservative line (or Constitution line or whatever) or former Massachusetts governor Mitt Romney, who compromised with Democrats and was an independent during Reagan-Bush on the Republican line.
Got it. I'd say there are many better systems for 3rd party representation then. If this is the only viable option, I'd support it. I wouldn't mind seeing the Greens or Libertarians screwing someone out of a presidency occasionally.