Ten states — seven of them controlled by Republicans —hold the key to whether the Obama administration succeeds at signing up 6 million people by the deadline of March 31. Those large states account for nearly 30 million uninsured — almost two-thirds of the nation's 47 million uninsured. That's why the Obama administration and advocates have focused so much attention on California, Texas, Florida, New York, Georgia, Illinois, North Carolina, Ohio, Pennsylvania and New Jersey. "It's like what Willie Sutton said when they asked him why he robbed banks. 'That's where the money is,'" said Jonathan Oberlander, health policy professor at the University of North Carolina at Chapel Hill. "The national figures are really being driven by just a handful of large states."