Belangrijkste races om Amerikaanse senaat 2020

 Whoever wins the White House, the composition of the U.S. Senate will shape what they can accomplish. Democrats will need to pick up three or four seats to gain a majority, depending on which party wins control of the vice presidency.

Republicans hold a slim 53-47 majority in the Senate. That means they could afford to lose two or three seats, while Democrats would need to pick up three or four for a working majority. If either party has 50 seats, the vice president becomes a tie breaker.

The list of potentially endangered Republican senators has grown. Sen. Cory Gardner is running against popular former Gov. John Hickenlooper in Colorado, a state that has become more Democratic blue than toss-up purple.

In battleground Arizona, Republican Sen. Martha McSally is trailing Democrat Mark Kelly, a former astronaut. GOP Sen. Susan Collins is relying on her independent brand to try to fend off challenger Sara Gideon in Maine.

Only one Democrat, Sen. Doug Jones in Alabama, appears seriously at risk of defeat.