McCain in 2000:

"never consider, ever consider, allowing a supporter of [his] to challenge [his opponent]'s right to be on the ballot in all 50 states.''

Political third parties have a very difficult time getting on states' ballots.  The rules are much tougher and they need a lot more signatures than the Reps. or Dems.  It's an unfair system that promotes our current two party debacle. 

Apparently John McCain and the Pennsylvania Republican Party have filed lawsuit to keep the Libertarian candidate for president, Bob Barr, off the ballot in that state. 

http://www.lp.org/news/press-releases/mccain-and-republican-party-try-to-block-barr-from-ballot

The Libertarian Party is America's third largest political party, founded in 1971 as an alternative to the two main political parties.  They should be on all state ballots without having to jump through hoops and pay costly legal fees out of the party's campaign contributions.

Here's a little tip about third party voting...a vote for them is NOT a wasted vote.  Their eligibility to be on your state ballot in the next election cycle is dependent on how high a percent of the vote they receive in this election.   The higher the percentage, the more likely your party will be on the ballot next time.

A vote for the lesser of two evils is still a vote for evil.