These are the top 10 states with Senate seats most likely to flip in 2020:
1. Alabama
2. Colorado
3. Arizona
4. North Carolina
5. Maine
6. Iowa
7. Georgia
8. Montana
9. South Carolina
10. Michigan cnn.it/34PrLob
Eight of the 10 seats on this list are held by Republicans, and many of those GOP incumbents' states don't look as red as they used to. cnn.it/31LgVNX
Democrats need a net gain of three seats to flip the chamber if they also win the White House — since the vice president would break a tie — or four seats if Trump wins reelection. cnn.it/31LgVNX
Democrats' path is complicated by the fact that they're likely to lose a seat in Alabama. Sen. Doug Jones has been in a perilous position ever since he flipped this seat blue in a December 2017 special election. cnn.it/31LgVNX
Here are some other Senators facing tough challenges: cnn.it/31LgVNX
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