I think the 2nd one is my favorite, musically speaking. If you only have time to watch one of them, I say watch "We Are the Ones"...
What do you think?
Yes We Can
www.yeswecansong.com
Plus after the song is over, wait for a bit... there are statements by the people in the video speaking about Obama and this election in their own words...
We Are the Ones
www.dipdive.com/dip-politics/wato/
(we are the ones we've been waiting for)
There's bonus footage after this video too.