BOSTON — The three Republican candidates for US Senate are ratcheting up their rhetoric, with two of the candidates calling on GOP hopeful Michael Sullivan to reject ads launched by a group they describe as anti-gay. The radio and television ads by the Conservative Campaign Committee are aimed at helping Sullivan defeat Gabriel Gomez and Daniel Winslow in the Republican primary. Gomez said Sullivan should tell the group to take down their ads or "deliver these attacks himself." Winslow faulted Sullivan for saying he wasn't familiar with the group, which Winslow described as "anti-gay." The group's leader has described gay...