Magic number for Democrats: 3, 4 or 5In the current Senate composition, Republicans hold 53 seats, while Democrats and Democratic-leaning independents hold 47. Democrats must gain three Senate seats to win a de-facto majority if they also win the White House, because the vice-president would vote to break a 50-50 tie. Easy races, tough racesIn Arizona, Democrat Mark Kelly has held strong, sustained leads in the polls for months over Republican Sen. Martha McSally. Theresa Greenfield, president of a real estate company, is looking to knock off first-term Republican Sen. Joni Ernst. Democratic U.S. Senate candidate Jaime Harrison has smashed fundraising records in his bid to upset Republican Sen. Lindsey Graham in South Carolina.

Source: CBC News October 22, 2020 08:01 UTC