I was initially curious why Google/DoubleClick were in there myself, since there aren't ads on the healthcare.gov site. Those requests look to be retargeting tags so they have the ability to do things like show banner ads on CNN only to people who have an incomplete marketplace application, along with conversion tracking so they can see which marketing campaigns led to completed applications or other goals. Presumably whoever controls the rest of the healthcare.gov marketing budget also runs the DoubleClick/AdWords account.