Control of Congress is at stake Tuesday, with ever-tight races for the House and Senate that will determine which party holds the majority and the power to boost or block a president’s agenda, or if the White House confronts a divided Capitol Hill. The key contests are playing out alongside the first presidential election since the Jan. 6, 2021 attack on the Capitol, but also in unexpected corners of the country after what has been one of the most chaotic congressional sessions in modern times. In the end, just a handful of seats, or as little as one, could tip the balance in either chamber. In the Senate, where Democrats now have a slim 51-49 majority, an early boost for Republicans is expected in West Virginia. Independent Sen. Joe Manchin’s retirement creates an opening that Republican Jim Justice, now the state’s governor, is favored to win. A pickup there would deadlock the chamber, 50-50, as Republicans try to wrest control. Read more about the top House races.