Frankly I could live with a few one-term Dems if the result is sending some GOPe RINOS to the showers.
Grimes won’t be a single termer if she gets in. KY may be a Red state in national politics, but it’s very much a purple state in other respects with a very strong and well established Democrat machine.
Grimes is a product of that machine, has a pedigree in Dem politics going back at least two generations (her Dad, iirc, was the longtime boss of the KY Dem Party, which is why she uses her maiden name so conspicuously.)
If KY Conservatives want to stay home in November, fine. If they want to go out and vote for Grimes, fine. But they really need to be fully aware of what they’re getting in return. She lands the seat and it’s hers until she doesn’t want it anymore.