If Russ Feingold(D-WI) had not lost re-election in 2010, Would he still be serving in the US Senate?

Would Feingold(D-WI) win re-election in 2016 and 2022 if he decided to run?
Would Ron Kind(D-WI) win the 2016 WI US Senate Election if he was the Democratic nominee instead of Feingold. Ron Kind-D vs Ron Johnson-R in 2016.
Ron Kind(D-WI) was elected to the US House in 1996 while Tammy Baldwin(D-WI) was elected to the US House in 1998? WI-3 was a swing district before 2022.

The Class 3 WI US Senate seat will currently be held by a Democrat. (Russ Feingold or Ron Kind).

1)Feingold wins in 2010,2016,and 2022.
2)Feingold loses in 2010 and does not seek a re-match,
Kind is the Democratic nominee who wins in 2016 and 2022.

Would Democrats will currently hold the Class 2 NC US Senate seat if the Democratic nominee for the 2020 NC US Senate Selection was Grier Martin or Jeff Jackson?

Democrats will currently have 54 US Senate seats with
52)Bill Nelson(D-FL) had he not lost re-election in 2018. The 2024 FL US Senate Race would be a Tossup if Nelson decided to retire or remain Democrat due to FL Republican craziness.
53)Grier Martin(D-NC) if he was the Democratic nominee in 2020.
54)Ron Kind(D-WI) if he was the Democratic nominee in 2016 and 2022. Russ Feingold had he not lost in 2010 and 2016 and ran again in 2022.