If the Republicans drop out of the YouTube/CNN debate, they'll only be hurting themselves in an election in which they are at a disadvantage. If they think that Republicans won't watch it, or else that all the questions are liberal, then they're not paying any attention at all to the new political landscape of this country.
As a democrat-leaning voter, I want the Democrats to win. But I also want to see what the Republicans have to say about different issues so that I know what it would be like to have one of them as President if the country decides to elect another Republican. And the perfect format for really seeing what they're made of is the YouTube questioning.

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The political affiliation of YouTubers
Haha, as somebody who has put up plenty of liberal videos up on YouTube, I can confirm that yes, there are an awful lot of conservative YouTubers who are not afraid to leave comments on things.
Seriously, I really haven't noticed a hugely disproportionate difference between the number of liberals and the number of conservatives on YouTube... I really haven't seen evidence that one is far and away more present than the other.
As a side note, who wants to join me in predicting that the Republican debate will get more video question submissions than the Democratic debate did? The Dem one attracted 2989 submissions. The GOP one already has 149 entries and they only opened it up on Tuesday. And they have until September. Now that people saw how neat the Dem one is, there are sure to be plenty more people uploading videos for the Republican one, although I'm not sure about whether or not this would be an indication of there necessarily being more people on YouTube who are Republican than Democrat-- probably more an indication of the greater exposure this format has attracted.
Also as an aside, I'm willing to bet that a significant chunk of the questions submitted are submitted by people who aren't YouTube users. That is, people who signed up for an account just so they could participate but haven't been active on YouTube before, for instance the Reverend who asked the gay marriage question in the Democratic debate only signed up for an account after a member of his congregation heard about the debate and thought it'd be a good opportunity. The majority of question-askers are undoubtedly regular YouTube users, but there's probably also a substantial chunk of submitters that are using the site for the first time.
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