NRSC Ad attacks Sen. Mary Landrieu (D-La.)for flip-flopping on illegal immigration. The ad compares Landrieu's two different votes on S. 1639 to Hillary ClintonHillary Rodham ClintonHow Democrats can rebuild a winning, multiracial coalition Ellison holds edge in DNC race Democrats face fierce urgency of 2018 MORE's flub on New York's plan for drivers' licenses for illegal immigrants.