A new Hart Research poll in six Senate battlegrounds — Arizona, Colorado, Iowa, Maine, Montana and North Carolina — finds Joe Biden leading Donald Trump, 50% to 41%.
Trump won four of these states — all but Maine and Colorado — in 2016.
The poll also found the Democratic challengers leading the GOP incumbent senators, 46% to 41%.


?Political Trivia
Eight moments in political history. Put them on a timeline.
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Five senators. Three bills. Can you guess how they all voted?
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Nine Justices. One case. How did they rule?
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Do you have your finger on the pulse of America?
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Four questions a day.
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