Presidential candidate and U.S. Sen. John McCain injected himself into the debate over autism while campaigning in Texas recently, rejecting numerous medical studies that dismiss the mercury-based preservative thimerosal as a cause. "It's indisputable that autism is on the rise among children," McCain said. "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."
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