He supported John Kerry's failed bid for president in 2004. In recent years, he has gained notoriety for being a so-called "expert" on global warming, notwithstanding the fact that he dropped out of high school. His recent global-warming schlockumentary The Eleventh Hour was a major box-office flop.
After Barack Hussein Obama won the elections of 2008, DiCaprio stated: "I couldn't be more proud of my country right now, proud to be an American, and I think the entire world was looking for a transition like this." He also hoped "Obama will have a stronger environmental agenda than the out-going Bush administration."
Despite his liberal politics, DiCaprio is said to be an avid shooter.