The implied argument: his singing America's praises was off-key in more ways than one.
It was the exact line of attack that Romney blasted in television interviews Friday afternoon.
"Is this the level that the Obama campaign is willing to stoop to?” Romney said on CNN. "Is this up to the standards expected of the presidency of the United States? I don't think the American people think so. I certainly don't think so."
His campaign has argued the Obama attacks are based on debunked reports, citing independent fact-checkers. Romney also equated raising his personal wealth with making a "personal attack," even as he's declined to offer the kind of disclosure of his full financial portfolio Democrats had demanded and even some Republicans suggested Romney would be well-served to offer.
Romney has released a full tax return for 2010 and an estimate of his filing for 2011. He said the full 2011 filing would come before election day.
The new 30-second Obama spot will air in Colorado, Florida, Iowa, North Carolina, New Hampshire, Nevada, Ohio, Pennsylvania and Virginia, according to the campaign. The states are the 2012 battlegrounds coveted by both campaigns.