Incumbents not seeking re-election in 2020
Name Party State
Lamar Alexander Republican Party Republican Tennessee
Pat Roberts Republican Party Republican Kansas
Tom Udall Democratic Party Democratic New Mexico
Alexander and Roberts stepping down is very good. We’ll replace with stronger Trumpers.
Probably no chance to take Udall’s seat, but stranger things have happened.
Dr Manny Sethi for US Senator https://www.drmannyforsenate.com/
Your list plus:
Republican - Isakson (GA) - Retiring
Republican - Enzi (WY) - Retiring