I cannot see that actually working. Hunter Biden's coke fueled escapades are already well known, and while it would be further confirmation to his base; would say someone like you care? Revelations about Obama/Biden spying or whatever; would it matter? First, for someone like yourself, or anyone in this thread, would you even believe something released by Bill Barr? Why would you believe it? For someone who thinks RussiaGate is real, it wouldn't be believed and why would one believe Bill Barr anyway? There is no good reason to believe him on that. If you think RussiaGate is fake, you will go "Okay" because its I guess confirmation though I'd say confirmation from an untrustworthy source.
For normal people, what can you even believe? All of it is just confusing partisan noise set amidst the material reality that is melting down and in some cases literally on fire around everyone. Every week some new horror emerges into our field of vision. The lived material existence of the average normal person is enough of an all consuming situation that I think come November, most of the public will be totally numb; and only the most serious partisans, the most committed of each parties base will still care.