U.S. Sen. Joseph I. Lieberman is rolling out the big gun in his increasingly close primary battle with Greenwich Democrat Ned Lamont. Former President Bill Clinton is slated to campaign on behalf of the three-term incumbent Monday in Waterbury, Lieberman's campaign spokeswoman said today. We are thrilled to have President Clinton come to the state to campaign for Senator Lieberman," the spokeswoman, Marion Steinfels, said. "It is not only a big day for our campaign, but it is a big day for Waterbury and Connecticut." Steinfels said Clinton was expected to speak in the late afternoon, but added that plans...