Hey, if Starchild can support an anti-gay Republican who is opposed not only to marriage equality but also immigration equality for gay people, I can support a pro-gay Libertarian who is in favor of marriage equality and immigration equality for gay people.
Y'all have already said that "purism kills," right? I'm going to support the candidate who is closest to my positions, purity be damned -- just like Starchild, Marcy, etc.
Sauce for goose, sauce for gander, etc. 
Cheers,
Brian