SOUTH KINGSTOWN, R.I. — With just over two weeks until Election Day, U.S. Sen. Sheldon Whitehouse and his Republican challenger, former Rhode Island Supreme Court Justice Robert Flanders, sparred Saturday night over single-payer health care, immigration and potential threats to Social Security and other safety-net programs during an hour-long debate at the University of Rhode Island.At one of the more heated moments, Flanders accused Whitehouse of "trying to scare people" into [...]