Really, any candidate who is on the ballot in enough states to be in with a mathematical chance of a majority of EVs should be allowed in. Same goes for any party leader in a parliamentary system whose party is fielding candidates in a majority of seats. Bollocks to what the polls say.
Personally, I'm glad that the debates focus on the two candidates that have a chance of winning, since I'm much more interested in their answers than the answers of third party candidates who have no chance at winning and represent a small portion of American political thought outside of the mainstream. Though I would be in favor of having one debate with the two major parties and the major third parties.
