De Villis did not return ABC News' multiple e-mails and phone calls. But he posted on the Huffington Post that Obama's campaign knew nothing of his role in the ad.
"The specific point of the ad was that Obama represents a new kind of politics, and that Sen. Clinton's 'conversation' is disingenuous," de Vellis wrote of the critical ad that uses an Apple computer TV ad to make Clinton appear like Big Brother.
"And the underlying point was that the old political machine no longer holds all the power," de Vellis continued.
"This ad was not the first citizen ad, and it will not be the last," de Vellis wrote ominously. "The game has changed."
Clinton seems to agree, saying, "This is a new era of campaigning. There's new ways of communicating, I think it's exciting that it is democratizing the process. You know, there may be some issues that will be raised that we have to look at down the road. But anything which brings people, particularly young people, to the political process I think is a net positive."
Asked if a political operative like de Villis posting such videos counts as "democratizing" the process, Clinton said, "Well, I'll have to leave that to the other campaign to comment on."
Obama has repeatedly promised to run a positive campaign that embraces a "different kind of politics."
Yet on Friday, in the same interview with The Associated Press, Obama refused to denounce the anti-Clinton ad.
"If you scroll down YouTube there are actually probably about a hundred ads of this sort, many of them directed toward me," he said. "But I guess this just captured the public's imagination a little more."
By Friday afternoon, the ad had been viewed on YouTube nearly 2.5 million times.
Throughout the week, Obama and his campaign have tried to distance themselves from the ad's creation.
Monday, Obama told Larry King in an interview that the ad was "not something that we had anything to do with or were aware of, and that frankly, given what it looks like, we don't have the technical capacity to create something like this."
After de Villis' role became known, Thomas Gensemer, managing director of Blue State Digital, issued a statement distributed by the Obama campaign saying, "Pursuant to company policy regarding outside political work or commentary on behalf of our clients or otherwise, Mr. de Vellis has been terminated from Blue State Digital effective immediately. … Mr. de Vellis created this video on his own time. It was done without the knowledge of management, and was in no way tied to his work at the firm or our formal engagement with the Obama campaign."
Friday, The Associated Press reported that de Vellis sent an e-mail in February telling friends he had worked on components that are in use on Obama's Web site.
"I designed the MyBarackObama toolbox that is on the front page and all the sidebar pages," wrote de Vellis.
Blue State Media told the AP that despite his e-mail, de Villis did no direct work for Obama's campaign.