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Democratic presidential candidate Hillary Clinton (left) and Sen. Elizabeth Warren wave to the crowd before a campaign rally at the Cincinnati Museum Center at Union Terminal on Monday. John Sommers II/Getty Images hide caption

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John Sommers II/Getty Images

Democratic congressional candidate Lucy Flores speaks at a campaign rally for Democratic presidential candidate Bernie Sanders in February in Las Vegas. Ethan Miller/Getty Images hide caption

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Ethan Miller/Getty Images

Guests stand after a Rand Paul speech at the Conservative Political Action Conference (CPAC) in Rosemont, Ill. Conservatives celebrated Tuesday's victory in Wisconsin's recall election. Scott Olson/Getty Images hide caption

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Scott Olson/Getty Images