John Edwards' campaign blasted Hillary Clinton on Thursday for a direct mail piece in Iowa that appears to be an attack by Edwards on Democratic rival Barack Obama, but is actually from a pro-Clinton labor union.

The mailer, which says it is paid for by the American Federation of State, County and Municipal Employees, criticizes Obama for his health care proposal. In it is a quote from Edwards that says "as many as 15 million Americans would be without coverage" under Obama's plan. The AFSCME has endorsed Clinton for the presidency.

"There have been a lot of misleading tactics and tricks in the last few weeks, but we've just never seen anything like this before. Either they are trying to trick people, or they've realized that on health care, John Edwards is the candidate who speaks honestly about what it really costs and what will be required to have truly universal coverage," Edwards' Iowa director Jennifer O'Malley Dillon said in a statement. "It's fine to have an honest debate about policy, but Iowans deserve better than planted questions and campaign fliers designed to fool them."

The Clinton campaign brushed off the Edwards statement Thursday and pointed out this wasn't done by them, but by the AFSCME. The Clinton camp added that the group is just using something Edwards actually said about Obama's plan -- not trying to mislead anyone that it is coming from Edwards.

Meanwhile, ABC News reported Thursday that Clinton registered the names of two new Web sites in order to attack Obama. The sites, Votingpresent.com and Votingpresent.org, are domains hosted by the same IP addresses as other official Clinton sites. ABC said Clinton intends to use the sites to portray Obama as cowardly for actions like voting "present" on contentious issues when he was an Illinois state legislator.

 Click here to read about the Obama attack sites.

FOX News' Aaron Bruns contributed to this report.