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Claire McCaskill

Sen. Claire McCaskill, D-Mo., speaks during a hearing on Capitol Hill in Washington this week. McCaskill, who is facing re-election in a heavily Republican state, says she will vote to not confirm Judge Brett Kavanaugh to the Supreme Court. Pablo Martinez Monsivais/AP hide caption

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Pablo Martinez Monsivais/AP

In this 1945 image, test subjects enter a gas chamber for a U.S. military experiment that will expose them to mustard gas. Courtesy of Edgewood Arsenal hide caption

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Courtesy of Edgewood Arsenal