Forget that. He already has Youtube covered. Youtube users who are liable to catch on will do that through the efforts of people who are already making videos, and those who will not catch on aren't going to change just because the man himself wasted time on it. And I hate to tell you, but out of the people who are going to vote in GOP primaries, a pretty small percentage ever watch videos on Youtube.
What he should do is make a bunch of 60 second radio ads where he addresses the voters personally on a different issue in each one. That would reach the audience he needs in an effective way.
If somebody wants to make webcam videos of him doing it and post those on Youtube, that's great. But him taking time to make videos (not just recording the videos but planning and writing the scritps) just for Youtube isn't worth it.