The Obama Administration is shot through with people like this because the Democratic party is shot through with people like this - you couldn't heave a brick at a Democrat gathering without hitting someone who thinks that President Bush had a hand in 9/11, or some other variant of the "BusHitler" meme (Ed. Note: Blogs for Victory strongly discourages hurling bricks at gathered Democrats…no matter how fun it'd be). The Democrats invited these kooks in to the party for the 2004 campaign. Michael Moore was the tip of the spear, but once the party was opened to people like Moore, they just came flooding in…and ended up providing the core support for Obama's candidacy.
What can the Democrats do? Conduct a purge - though they won't do it until they're beaten. So, we'll have to put up with Van Jones and his like at least through November of 2010.