News roundup: Cassidy, Landrieu set to square off in Dec. 1 televised debate … Republicans urged to reject wind tax credit during lame duck session … Gleam is gone as gold prices sink to four-year low

Face to face: Republican Senate candidate and Rep. Bill Cassidy has agreed to one debate with Democratic Sen. Mary Landrieu before the Dec. 6 runoff election. Landrieu called for six debates in the mo…