Sen. Jon Tester, D-Mont., faces a potentially tough re-election bid. Win McNamee/Getty Images hide caption

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NPR's Martin Kaste on the Montana Senate race
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Sen. Jon Tester Decries Citizens United's Impact In Montana, Nationally
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GOP Gains Advantage After 'Citizens United' Ruling
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'Citizens United' Ruling Opened Floodgates On Groups' Ad Spending
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