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Updated July 22
In the 2020 US Senate races, the Republicans will be defending 23 seats while the Democrats will only be defending 12. In theory this gives an edge to the Democrats who will also be on the attack against an incumbent Trump. In 2014 when the same third of the Senate was up, and Barack Obama was in the White House, the GOP gained 9 seats and took control of the chamber. However, many of the Seats the Republicans will be defending are in states where Trump did well in 2016. Right now polls suggest the GOP will hold on to power in the Senate if they can win at least one tossup.