In the first month of 2015, 102 cases of measles were documented in the United States. Over 14 states reported outbreaks. So why has this highly contagious, nearly eradicated disease returned with a vengeance?

According to Jon Stewart, “Like most things, you can blame it on science-denying, affluent California liberals.”

Stewart has some harsh words for the parents in Northern California’s Marin County who have decided against vaccination, and for Republican politicians like Rand Paul and Chris Christie who claim vaccinating is a matter of “personal freedom.” As Stewart points out, choosing not to vaccinate your children against measles and other infectious diseases puts others at risk. But those on the fringe of the right and left are united in their opposition to vaccinating. According to Stewart, “There’s no 'red America,' there’s no 'blue America.' There’s just a needlessly sick America.”