Hillary Clinton in The New York Times

On Health Care: The science is clear: vaccines work

Hillary Clinton weighed in with a jab at vaccine naysayers: "The science is clear: The earth is round, the sky is blue, and vaccines work."

Howard Dean, a presidential candidate in 2004 and a former DNC chairman, said there are three groups of people who object to required vaccines: "One is people who are very much scared about their kids getting autism, which is an idea that has been completely discredited. Two, is entitled people who don't want to put any poison in their kids and view this as poison, which is ignorance more than anything else. And three, people who are antigovernment in any way."

"But the truth," added Dean, a physician, "is you can be conservative without putting kids in harm's way."