Contrary to the headline on this video (and sorry, there's a brief ad that prefaces it), this is not "Julian Assange Attacks Sarah Palin." A more bullshit blurb could not be written. It is, however, Julian Assange responding to the calls by people for his assassination.
It comes from this article by Glenn Greenwald on the decision by the UN to investigate the abusive treatment in detention of Bradley Manning.
In another article, Andrew Kreig investigates the possibility that Karl Rove's dirty fingerprints might be involved in the zeal to prosecute Assange as well.