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McConnell has a higher disapproval rating than Beshear has an approval rating in his own state (64%, with an approval rating of just 29%).  As a bonus, he's the most unpopular Senator in Congress. -Source 
Tell me again how he keeps getting reelected without corruption or rigging it...
Kentucky, you're weird for having a D gov with 60% approval, and still voting for McConnell and Paul.  ELI5.
eta:  Thank you all for the answers.