Harvard Law professor, Vineyarder, and baseball fan Alan Dershowitz joined Brookline author Larry Ruttman behind the mike at the Martha’s Vineyard Sharks game against the North Shore Navigators on Thursday. Dershowitz called the game while Ruttman — author of the soon-to-be-released book “American Jews and America’s Game: Voices of a Growing Legacy in Baseball” — asked him questions about his life. You can hear their back-and-forth, which features Dershowitz hilariously spitting out political philosophies just before he pauses to call plays, on the Sharks website.