President Barack Obama didn't know about the problems with the Affordable Care Act's website -- despite complaints from insurance companies and the site's crashing during a test run -- until days into its now well-documented abysmal launch, the nation's health chief told CNN on Tuesday. In an exclusive interview with CNN's Dr. Sanjay Gupta, Health and Human Services Secretary Kathleen Sebelius admitted Tuesday that there is significant concern in her department and the White House over the technical debacle surrounding the Obamacare website's rollout. The site was supposed to make it simple for people to search and sign-up for new...