Resolves to whichever race ends up being the tightest, measured by final vote margin. If the closest Senate race is ultimately one not on this list, I will still resolve to whichever of these 10 is the closest.

i.e. if most races are won by 2%+ points but one race is won by just 1%, then that one race would be considered the closest.

Trading closes November 4th.

Inspired by: Tracking the Senate's Most Competitive Races (NYT)