Sam L. Larsen, 22, of Edgartown, graduated summa cum laude from American University School of Public Affairs in Washington, D.C. Sam is a member of Phi Beta Kappa, and the son of Dan L. and Marie Larsen, who with other family members will attend his May 11 graduation. His interests are government and law. “He ain’t going fishing,” said his father, who owns Edgartown Seafood.