proportion of U.S. voters watch youtube?
I don't either, but compared to those who watch FOX and ABC (both of which are beating this Wright drum nonstop), I suspect it is relatively small.
Plus we have abundant evidence of Obama supporters' penchant for "viral" action. With an army zombies like this, it's not hard to run up the youtube hits.
CBS Poll: Good Reviews For Obama Speech
Sixty-nine percent of voters who have heard or read about Obama's speech say he did a good job addressing the issue of race relations, and 63 percent of voters following the events say they agree with Obama's views on race relations. Seventy-one percent say he did a good job explaining his relationship with Wright. ... Overall, the speech and events surrounding the matter have found a wide audience. Most voters say they have heard or read some about these events, including 42 percent who have heard a lot about it. Just four percent of those surveyed had not heard about the controversy.
...
Overall, the speech and events surrounding the matter have found a wide audience. Most voters say they have heard or read some about these events, including 42 percent who have heard a lot about it. Just four percent of those surveyed had not heard about the controversy.
you can find at least one that says the opposite. Plus, this was a re-poll of people who'd been sampled earlier. The question might go something like this: "Yesterday you said you felt [x] about Obama. He has now given a major address on this topic. Do you feel that his address has improved your view of him?"
Respondent: Yes, sure, I guess so.
ABC and Fox don't seem to be big Democratic voter strongholds, either.
I daresay the only network with lower ratings than ABC is the CW, and I would be shocked if a Fox viewer was receptive to voting Democratic at all in the first place.