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

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. Late on Tuesday, Democrat Scott Colom was about 2,600 votes ahead of Republican incumbent Cindy Hyde-Smith in the race for the US Senate in Mississippi.

Unlike in some other states, there is no central vote reporting system for Mississippi, and few counties release election results online. Instead, journalists from The Associated Press and analysts communicate with each of the state’s 82 counties directly for the latest available information on vote counts.