Kentuckians are a proud bunch. If someone were to start hammering away now at how the little guy in Kentucky has been totally conned, snookered by McConnell, it will resonate. While his despicable stance on health care will be the primary force pushing against McConnell in his own state in 2020, the nail in the coffin would be a relentless campaign of framing McConnell for the crook he is. Just keep pounding away at that $800,000 he took from Russian oligarch Oleg Deripaska and various other dark money schemes he's been involved in. Compare how his own finances have risen exponentially over the years while fellow Kentuckian's wages have remained stagnant for decades. Make McConnell the poster child of dark money.
Kentuckians don't like to be laughed at. There is, unfortunately, a long history of jokes insulting their intelligence. It's more of a regional thing perpetuated by people in surrounding states, particularly those in Indiana, but nonetheless it has existed for well over 50 years and has spawned its own cottage industry of "How dumb?" jokes. I bring this up NOT to give credence to the jokes, but to simply point out that Kentuckians are highly sensitive about not wanting to be seen as lacking in intelligence. Thus, they have a heightened sense of awareness that if they end up characterized as people who blindly continue to support a local outed con man, this would only give further fuel to the jokes.
Plus, Kentuckians actually have a deep-seated disgust for con men, once they've been outed as such. Believe it or not, there is an old saying that is still often quoted in the hills of Kentucky: "Fool me once, shame on you. Fool me twice, shame on me." This should be in every in-state campaign ad within Kentucky against McConnell. Indeed, Dems running against Rethuglican incumbents statewide in Kentucky would be wise to adopt this slogan. It speaks to Kentuckian's roots as proud people who are tired of being maligned and really can't stand being snookered (tRump not withstanding).