Voters participate in early voting Friday in Silver Spring, Md. Alex Wong/Getty Images hide caption

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Any Way You Describe It, 2012 Campaign Spending Is Historic
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Costumed demonstrators on Oct. 3 in Denver, before the first presidential debate. Doug Pensinger/Getty Images hide caption

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Study: Secret Donors Significantly Fueling Pro-Romney TV Ads
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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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