Despite a cease-and-desist from NBC News, the VoteForChange.com ad on Sen. Barack Obama's YouTube channel featuring NBC and MSNBC remains available.

NBC News spokeswoman Allison Gollust tells TVNewser YouTube has agreed to pull down the video (it is still up at this time) and will continue to police it. But the Obama campaign, apparently, isn't budging.

"We have engaged the Obama campaign on the legal front and demanded that they stop using the ad," Gollust says. "To date they have not complied. Their response was to put a tagline at the end of the ad. However, that is not good enough, and we continue to demand they cease and desist using this outrageous ad."

The tagline reads "NBC and MSNBC did not cooperate in the making of this video" and flashes for three seconds at the end of the ad.

The spot has been seen more than 566,000 times, and features the image of Tom Brokaw and voice of Keith Olbermann announcing a mock victory for Sen. John McCain.

Click continued to see the ad...