John McCain thinks vaccines cause autism.

And you thought it was bad in the UK. When replying to a mother with an autistic child in a town meeting a few days back the republican presidential candidate said the following:

"It’s indisputable that (autism) is on the rise amongst children, the question is what’s causing it. And we go back and forth and there’s strong evidence that indicates that it’s got to do with a preservative in vaccines."

It's especially depressing when you realise compared to Huckabee and Romney, this is the Republicans most 'pro-science' candidate. 

You can read more about it here and here.