BOSTON (AP) -- Rep. Barney Frank's decision to step down at the end of his term is the latest jolt to the bruised ego of the Massachusetts Democratic Party, which once counted Kennedys, House speakers and a president among its ranks. Instead, some of the state's best-known political figures are now Republicans, among them Sen. Scott Brown and presidential candidate Mitt Romney. "For a long time, Massachusetts Democrats have felt they played a special role in the national Democratic Party," said Tufts University political science professor Jeffrey Berry. "I think that has gone at this point. There is no one...