Not all libertarians believe in the same thing. Let's just clear that up.
I believe in government. I'm a "classic libertarian." The government exists to preserve my rights as a human. These rights will vary from person to person depending on who you ask.
However, this election is far too close for me to vote for my candidate of choice. I will be voting for the lesser of the two evils rather than for my own party. Not because I believe it is the right thing to do, but because I feel we will be even further away from my ideals if for some reason the wrong candidate did go into place. For me, in this election, social issues are more important. I understand there is an economic crisis, but I don't feel either candidate has the solution. But the place where change can be made is with social issues. That's where my vote will be.