Seeking to brand himself as the anti-establishment politician, Rep. Joe Sestak has put up a Web ad directly attacking President Obama for supporting Republican-turned-Democrat Sen. Arlen Specter in the Pennsylvania primary.

It features a black-and-white montage of Obama supporters expressing deep disappointment that the president is supporting Specter. An acoustic star strums throughout, the whole effect similar to the "Yes We Can" music video made by Will.i.am of the Black Eyed Peas in the 2008 campaign.

"That's not change we can believe in," the Obama/Sestak backers say.

The theme of Joe vs. the Powers that Be, which has run through the entire campaign, took an interesting turn last week when Sestak, in response to a question, told Comcast Network host Larry Kane that the White House had offered him an important federal job in order to drop his challenge to Specter.