Senator Ted Cruz, a Republican from Texas, speaks at a Heritage Action Defund Obamacare Town Hall event in Dallas, Texas, U.S., on Tuesday, Aug. 20, 2013. Heritage Action for America yesterday announced a $550,000 online ad campaign, that will run in 100 Republican-controlled districts, urging lawmakers to support efforts to stop funding for the health-care law. Photographer: Mike Fuentes/Bloomberg via Getty Images