This video is significant development, and reflects the changing nature of this modern race for president. Obama’s speech, on which it was based was very, very good, and the song and video are as well. You can read more about it here and here (produced in 48 hours?!- wow).
But also of note is the impact of Internet video and YouTube in particular. This video has already had over 700,000 views in a couple of days, as did his YouTube response to the State of the Union. Bypassing mainstream media isn’t new, but it is getting more and more effective.
Obviously this will not change the minds of anyone over 35, but for younger voters this kind of approach and this video in particular will be significant. To them Obama is a new kind of politician and this is a new kind of movement. Of course he really isn’t and this isn’t, but that doesn’t really matter if young people get out and vote in large numbers.