In 2006, Beach ran as a candidate to lead his Lake Manitoba First Nation; he was not successful but said he will try again. In 2007, Beach starred in HBO Films' adaptation of Dee Brown's history, "Bury My Heart at Wounded Knee." In the film, Beach portrays Charles Eastman (Dakota name Ohiyesa), a doctor, Sioux advocate, and author. He explores and expresses the changing understanding of Aboriginal-US relations during the period leading up to the Wounded Knee Massacre.