It's Super Tuesday south of the border, and American politics are finally becoming interesting again rather than just depressing. The web is crowded with candidate support videos, and one of the oddest and most widely disseminated is "Yes We Can," assembled by Black Eyed Pea will.i.am. Distractingly overlaying an Obama speech onto a rootsy acoustic track, the video features appearances by fellow musicians Common and John Legend, but also Scarlett Johansson (who's releasing an......