Biden tests presidential waters in S.C. Touts bipartisanship, bond with state's former leading Democrats Columbia, S.C. | U.S. Sen. Joe Biden heads into his quest for votes in a 2008 presidential primary in South Carolina with a well-exercised sense of what to say and what to leave unsaid to Republicans and Democrats alike. The Delaware Democrat knows enough to avoid laughing too hard at a Clemson University joke - particularly a few days after the Upstate school lost a nail-biter to its in-state rival, the University of South Carolina. Biden told a crowd of more than 230 at a Columbia...