WASHINGTON (CNN) - Hillary Clinton's presidential campaign strongly criticized Barack Obama Sunday for not condemning an outside group's television ad set to run in Ohio on his behalf.
The campaign says the issue is not the content of the ad, but that the Illinois senator has"flip-flopped" from his previous stance on running these kinds of ads.
Clinton spokesman Howard Wolfson told reporters on a conference call that the campaign has been made aware of an upcoming ad buy from the United Food and Commercial Workers Union set to launch in Ohio on Tuesday. Wolfson said the 1 million-strong union, which backs Obama, is planning on spending "hundreds of thousands of dollars."
Wolfson called on Obama to denounce the ad, and accused him of shifting his stance from late last year, when he criticized similar ads being run on behalf of John Edwards in Iowa.
"What we see is Sen. Obama saying one thing in Iowa when it benefits him, doing another thing in Ohio when it benefits him," Wolfson said. "In Iowa, he criticized this kind of spending, but in Ohio he is largely silent."
The Clinton campaign is also the beneficiary of an outside group's television ad in Ohio. The American Leadership Project, founded by several backers of the New York Democrat, unveiled a pro-Clinton ad last week.
Wolfson said the campaign has no involvement with the group and maintained the issue is not whether outside organizations should be able to run ads.
"The issue is whether or not Sen. Obama will apply to himself the same standards he set on Sen. Edwards," he said. "We did not criticize John Edwards for the activity on his behalf as Barack Obama did."
- CNN Ticker Producer Alexander Mooney