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In a year of liberal challenges to President Donald Trump, an avowed centrist scored the Democratic Party’s biggest coup -- flipping a red state’s U.S. Senate seat.
Tuesday is Election Day. Here's how you can follow the results, understand the stakes, and know which races CBS News is looking at.
The battle for Senate control finds Democrats trying to mount upset challenges in a string of typically Republican states, and this round of Battleground Tracker polls shows them having at best mixed results so far.
