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

[You don't see any blue avatars now]

2008: MN and KY
2010: WA and WI (sorry Patty Murray)
2012: ND and AZ (not really enthusiastic about either)
2014: NH and NC (I think it'd be funny to have a two-state Senator in the present day)
2016: NH and WI
2018: AZ and MO (and what the hell; WV and IN too)
2020: CO and NC (f[inks] Cunningham, but I still want a Democrat from NC, and Gardner would be blanched in 2026)
2022: PA and WI

I guess senators in the seats I changed ITTL:
MN-2:
Norm Coleman (2003-2015)
Betty McCollum (2015-)
KY-2:
Mitch McConnell (1985-2009)
Bruce Lunsford (2009-2015)
Matt Bevin (2015-)
WA-3:
Patty Murray (1993-2011)
Dino Rossi (2011-2017)
Suzan DelBene (2017-)
WI-3:
Russ Feingold (1993-)
ND-1:
Kent Conrad (1992-2013)
Rick Berg (2013-)
AZ-1:
Jon Kyl (1995-2013)
Richard Carmona (2013-2019)
Martha McSally (2019-, though I'd prefer a re-elected Carmona to McSally)
AZ-3 (changed through butterflies of McSally winning):
John McCain (1987-2018)
Jon Kyl (2018-2020)
Mark Kelly (2020-)
NH-2:
Jeanne Shaheen (2009-2015)
Scott Brown (2015-2021)
Annie Kuster (2021-)
NC-2:
Kay Hagan (2009-)
NH-3:
Kelly Ayotte (2011-2023)
Joyce Craig (2023-)
MO-1:
Claire McCaskill (2007-)
CO-2:
Cory Gardner (2015-)
PA-3:
Pat Toomey (2011-2023)
Mehmet Oz (2023-)

Honorable mention:
WV-1:
Joe Manchin (2010-2019)
Patrick Morrisey (2019-)
IN-1:
Joe Donnelly (2013-)

EDIT: Considering trends, Georgia would've been a good pick in 2008 as well; I just wanted the satisfaction of taking down Cocaine Mitch.