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While the anti-Romney ad has drawn the most vociferous criticism to date in this campaign, the president described himself Thursday as the victim of an out-of-control campaign finance system.

“Over the next three months, you will see more negative ads, more money spent than you’ve ever seen in your life,” Mr. Obama said at a campaign event in Pueblo, Colo. “I mean, these super PACs, these guys are writing $10 million checks and giving them to Mr. Romney’s supporters. And basically, they all have just the same argument. They all say the same thing. They say the economy is bad and it’s Obama’s fault.”