LANCASTER, Pa., March 29 — Representative Patrick J. Toomey, Republican candidate for Senate in Pennsylvania, has been ripping his opponent for being a "Ted Kennedy" liberal, too fond of taxes and spending, too close to activist judges and trial lawyers, too supportive of abortion rights and the United Nations. Never mind that his opponent, Senator Arlen Specter, is a four-term Republican who has been endorsed by the nation's conservative-in-chief, President Bush. Party cleansing, not party unity, is Mr. Toomey's goal. "The problem we've got is a handful of Republican senators who never really bought into the idea of the Republican...