Amen, Brother.
The problem is not YouTube any more than it used to be TV cameras, radio microphones or reporters' pens and pads. It is about the candidates' core beliefs and genuineness of personality.
As a reporter of some 30 years' of experience, I've known scores of politicians -- most of whom I liked, irrespective of ideology or party affiliation -- yet for many there is a latent strain of smarminess, toadiness and insincerity. One advantage movement conservatives have enjoyed is that they are true believers -- no matter how ill-conceived, illogical or idiotic their positions may be. I've met George W. Bush, many years ago in a setting which was primarily social, and he is (shock!) a nice guy -- although the smirkiness he demonstrates in public settings these days is certainly off-putting. Voters recognize that quality and find it reassuring, despite whatever misgivings they may have about his intellect -- which isn't substantial -- or ideology.
It isn't just about being "on-message" -- which isn't a problem for candidates who believe in their positions -- and connecting with voters isn't difficult for someone who likes people. What it boils down to is being genuine. If you're a racist, it will show. If you are arrogant, likewise. However, if you like people and genuinely want to serve them -- even if the policies being pursued are misguided or the agenda helps only a narrow base of the public (i.e. BushCo and his fat-cat buddies) -- then voters are perceptive enough to make the distinction between the real and the phony.