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Fast facts about Americans' views on Russia amid allegations of 2020 election interference
By Carroll Doherty
Dem megadonors stand pat as Bernie soars
By Maggie Severns
Pete Buttigieg interview: Buttigieg pitches himself as "only candidate" who has beaten Sanders so far
By Caroline Linton & Ed O'Keefe
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The 2020 Nevada caucuses: Live updates
By Veronica Rocha & Fernando Alfonso III
Bernie Sanders just declared war on the Democratic establishment
By Christopher Michael Cillizza
Bernie wins again - POLITICO
By David Siders, Laura Barrón-López & Marc Caputo
How to Win the Democratic Nomination, and Why It Could Get Complicated (Published 2020)
By Matt Stevens