When asked this morning about President Obama's response to the super PAC ad that ties Mitt Romney to a victim of cancer, CBS's Norah O'Donnell had this to say:

"Look, this is a question that Obama has to answer for--which is about the tone of the campaign," O'Donnell said. "Many people believe that Obama was about 'hope' and 'change' in 2008, but it is true he ran a very negative campaign in 2008 as well."