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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Former Massachusetts Gov. Mitt Romney gives a victory speech Tuesday in Novi, Mich., after winning the state's primary. Gerald Herbert/AP hide caption

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NPR's Martin Kaste on the Montana Senate race
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Kerry: Syrian Regime's 'Days Are Numbered'
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Obama Delivers Rousing Speech To Autoworkers
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Honda has a huge presence in Ohio, where the company and its suppliers are hiring. Here two advanced continuously variable transmissions undergo leak testing at the new assembly line at the Honda plant in Russells Point, Ohio. Ron Lietzke/AP hide caption

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How A Swing-State Upswing Could Alter The '12 Race
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Putin Biography Chronicles Rise Of A 'Street Thug'
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Santorum Challenges Rivals Religous Freedom Views
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Congress Works To Mend Economy, Approval Ratings
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State Of GOP Race: No Momentum For Candidates
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