Which key races remain undecided one week after the US midterms?

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It has been more than a week since voters in the United States cast ballots in the midterm elections. But the size of Democrats’ majorities in the House of Representatives and Senate remained undetermined. More than a dozen congressional races are still waiting to be called. Democrats have already won 54 Senate seats in the incoming Congress in January, but they could pick up one or two more as votes are counted in Alaska and Mississippi. Meanwhile, in the House of Representatives, Democrats have notched their largest elected majority since 2008, with 255 seats in the 435-member chamber. But they have the potential to add to their lead with several more seats as the remaining races are decided.