I rate it as
Lean D. Gov. Beshear can beat Daniel Cameron especially with the Breonna Taylor case.
However, McConnell will resign and retire in 2023-24 if Cameron wins and Republicans are in a Senate minority, he would not want to wait until 2025 for a Senate Republican majority
Add it all up and you get this: If McConnell and Republicans lose the Senate majority this November, they might not have a realistic chance to win it back until 2025. Which is a long time for McConnell to wait to regain his position of power.
https://www.cnn.com/2020/06/17/politics/mitch-mcconnell-senate-2020-senate-2022/index.html