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Pennsylvania, Georgia, Nevada and Arizona come into focus in final days. Plus: where things stand in seven other Senate contests.
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Recent events are giving Democrats hope of retaining the 50-50 Senate, which they narrowly control with the vice president casting tie-breaking votes.
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Though more Republican-held seats are up for grabs in November, Democratic struggles mean the GOP has improved its likelihood to take control of the Senate. Here are the key contests to watch.
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Sen. Bernie Sanders won narrowly, but can he expand his base? Pete Buttigieg again did well, but in another largely white state. And the story of the night was Sen. Amy Klobuchar's third-place finish.
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The moderate focused his campaign on New Hampshire, but showed little upward momentum throughout his run.
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The four senators running for president will mostly be off the campaign trail in the final days before Iowa votes. They'll work around the impeachment trial with Skype, surrogates and red-eye flights.
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An impeachment trial could keep Elizabeth Warren, Bernie Sanders and other senators running for president stuck in Washington in the final weeks before the Iowa caucuses.
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In format and style, the second CNN debate was almost a clone of the first. Once again, the emphasis was on finding points of contention and stoking the tension between candidates.
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Wednesday night's lineup includes a rematch between former Vice President Joe Biden and California Sen. Kamala Harris. Follow NPR's real-time analysis as 10 presidential hopefuls make their case.
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Former Vice President Joe Biden will again be center stage — and the focus will be on how he handles issues of race and whether he looks like he's ready and able to take on President Trump next year.