Nathan "Nate" Kleinman is a human rights activist and political organizer. He is noted for undertaking two political fasts, running for Congress as the "first Occupy candidate," and for his role as a top aide to former Congressman Joe Sestak during his 2010 U.S. Senate campaign. He is an active participant in the Occupy movement and was a candidate for U.S. Congress in the 13th District of Pennsylvania for the 2012 election.