If you could change the result of one senate race in favor of both parties in each election cycle

[Heisenberg]

Fun thread!
Assuming each is in a vacuum (hence, getting rid of Graham all three times), here's mine

2008: SC (bye bye, Lindsey and easy to win back in 2014) and MN (I think Republicans hold it in 2014 but Coleman sees the writing on the wall and retires in 2020)
2010: IL and CO (I wish I could say DE with Mike Castle, because he holds the seat in 2014 as well but he didn't win the primary IRL and the margin for the OTL general was >15%. However, in 2016, Glenn came within 5 of Bennet despite Trump losing the state, so maybe Buck could hold on? He's toast in 2022 regardless)
2012: AZ (Flake wasn't that good and this seat would fall the next cycle anyway) and MT (getting rid of Tester)
2014: SC and MI (If I can't do SC again, then CO because Gardner is toast in 2020 anyways)
2016: AZ (Republicans would lose this seat before 2022 anyway) and NV
2018: MS (I guess, because it's up two years later and should be won back) and OH
2020: SC (If I have to pick someone else, uh? IA? Probably the easiest to win back) and GA (The Perdue seat)
2022: IA and NV: These were hard, but Iowa should be (on paper) the easiest to win back in 2028 and Laxalt is probably my favorite of the unsuccessful GOP nominees (honestly, most of them SUCKED). Of course, I'm treating each of these years in a vacuum. If we're pretending Heck (whose race I flipped in 2016 in this scenario) is up for re-election, then AZ, I guess.