WEST DES MOINES, Iowa (CNN) - Democratic presidential candidate Barack Obama continued his attacks on rival John Edwards for alleged ties to 527 groups airing ads on his behalf. Obama said his opponent's inability to get the ads pulled might point to his potential ineffectiveness to enact his reform agenda as president.
"My attitude is if you can't get your former campaign manager and political director to do what you'd like, then it’s going to be hard to get the insurance companies and drug companies to do what you want," Obama told reporters during a stop at a suburban Des Moines diner, adding that he hopes Edwards "takes this seriously."
After similar comments from the Illinois senator Saturday, Edwards said he would call on the group Alliance for a New America to stop running the ads, but that he had no authority to force them to take the spots off the air. His 2004 campaign manager is now a part of Alliance for a New America.
"This is somebody who worked for John Edwards for the last who knows how many years, who is a good friend and colleague of Edwards who's now running a 527 that is running ads on behalf of John Edwards,” said Obama Sunday. “If you're telling me that he has no influence over him, that’s just not true."
Obama was also asked if it is a candidate's duty to control the actions of 527 groups - independent organizations that can raise unlimited funds for ads as long as they do not directly advocate that individual's election.
"I think you do have some influence," Obama said, adding that it's "important for us to be consistent in our views." Obama said he would make a similar request of any 527 groups that ran ads on his behalf, "just to be consistent."
–CNN Iowa Producer Chris Welch