Left wing during Bush's first term, but right wing after that. A lot are also people that aren't very political but are easily swayed by populist rhetoric from the likes of people like Jones (I'm thinking of a guy I work with here. He doesn't even vote, not even for fringe parties.)
I would bet he would like Ron Paul given that most Alex Jones fans are Paul fans too. To answer the question, most truthers are right-wing. When Bush was president, the truthers were more left-wing but as time goes, less leftist are people that believe Bush and co were behind 9/11.