Romney campaign releases ad featuring Biden 'buried' comment

Romney says that the middle class, in particular, has been hard hit under the Obama administration. "The middle class in America is hurting," the ad shows Romney saying. 

The ad then shows a clip of Biden's speech.

"The middle class has been buried the last four years," Biden says. 

The Romney campaign quickly seized on Biden's remarks to hammer the Obama administration over its economic record. 

At a stump speech a few hours after Biden's statement, Paul Ryan said Republicans agreed with the vice president's comments.

"That means we need to stop digging by electing Mitt Romney the next president of the United States. Of course the middle class is being buried ... they're being buried by the Obama administration's economic failures," Ryan said Tuesday.

At a later campaign speech on Tuesday, also in North Carolina, Biden modified his speech and said that the middle class had been buried under policies backed by Romney and Ryan.