Try leaving comments at the "Obama Girl" videos that ask whether she would still have a crush on Obama if she knew:
(1) That Obama endorsed the prominent racist and anti-Semite Al Sharpton, and his hate group the National Action Network. Suggest that readers Google on "Sharpton" or "National Action Network" AND "Freddy's Fashion Mart" or "white interloper."
(2) That Obama accepted money from a fundraiser hosted by Allan Houston, who with a fellow Knicks player effectively called Jews Christ Killers.
(3) That Obama appeared at a MoveOn.org PAC event. MoveOn is an anti-Catholic and anti-Semitic hate organization whose disgraced Action Forum was full of hate speech (including blood libels of Jews and blanket descriptions of all Catholics as pedophiles), while MoveOn's official publications included a derogatory picture of Pope Benedict.
(4) Things can also be said about Obama's pastor Jeremiah Wright, who accompanied Louis "Judaism is a gutter religion" Farrakhan to Libya to visit Moammar Khadafy.
You can't fit all these things into one comment, but a nice and regular sprinkling of them will help. Make sure they are relevant to the video, though, so as to play by the rules.
Another thought is to encourage Hillary Clinton's backers to do the same. Never mind that Hillary also appeared at the National Action Network; Obama's people can go after her on that one.
What we need, though, is widespread publicity for both candidates' association with Sharpton's hate group. By next year, the best they might do is get elected Kleagle of some backwoods Klavern--well, Obama admittedly wouldn't have much chance of that, but Hillary might make it.