1. Arizona, with Sinema (D). Democrats might run a serious primary against her. She marginally won in 2018.
2. California, with Feinstein (D). I seriously expect her to retire prior to that election, and the Governor likely to name either himself, or London Breed (SF's mayor) to fill, and then run in 2024.
3. Florida, with Rick Scott (R). He needs some help, but big question....who can the Democrats drag up to run against him.
4. Indiana. Republican marginally won the last election.
5. Michigan's Stabenow (D). Will be a tough race, and various people being discussed. She won with 52-percent in last election.
6. Missouri's Hawley (R).....marginally won with 51-percent in last election.
7. Montana's Jon Tester (D).....marginally won the last election. He hasn't said intent yet. Likely to be a new D coming out to the primary.
8. Texas. Ted Cruz (R) marginally won his last election (51-percent). I am expecting Beto coming to run for the seat again.
9. Vermont. Bernie Sanders. I think he will retire at the end of 2024. New face appearing.
10. West Virginia's Manchin (D). I think he will stand down, and very likely for a Republican to win this race.