Libertarian was always my alternative to having to vote for McCain in AZ I could not stand the guy but I was not about to vote for his Democrat opponent. So, I used the Liberterian line as my trash can to throw away my vote. Kennedy is no libertarian. He is a tried and proven liberal Democrat. As such, I would not even vote for him on the libertarian line
I did the same when I lived in Arizona. McCain forced me to become a Libertarian for a while. I even was a party volunteer working on campaigns for a while. But I soon realized how foolish and useless the Libertarian Party is. So I got the heck out of Arizona AND the Libertarian Party.