Obama Ad: Super PAC Won't Back Down

Campaign ad implies Mitt Romney was responsible for death of man's wife.
3:00 | 08/09/12

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Transcript for Obama Ad: Super PAC Won't Back Down
Your voice, your vote. Where the war of words and ads turned red hot today. Both sides are spending at an unprecedented rate. 1 billion by election day. As jon karl tells us, they are playing fast and loose with the facts to a degree we've never seen before. Reporter: In colorado today, president obama lashed out as those super-pacs, spending millions of dollars on negative ads. You will see more negative ads. These super-pacs, these guys are writing $10 million checks, giving them to mr. Romney's supporters and -- Reporter: But the single most outrageous ad of the campaign comes from a super-pac supporting the president. And run by his former spokesman. It features a man he once worked for a company oinowned by bain capital and immrims romney was responsible for the death of the man's wife from cancer. By then, it was stage 4. It was -- there was nothing they could do for her. And she passed away in 22 days. I do not think mitt romney realizes what he's done to anything. Reporter: In fact, the man's wife died in 2006, years after romney left ba capital. But the group isn't backing down. What this ad does is, items a story of one guy -- but it's misleading. THIS IS YOUR OPINION. Reporter: Romney campaign has hit below the belt, too. Currently with a misleading ad claiming president obama has gutted welfare reform. The obama administration quietly offers to issue waivers to the work requirement in the law. Reporter: The obama campaign is calling that a bold-faced law. The administration is allowing states to experiment with changes, but insists it is still requiring people to work. Here in boston, the romney campaign is already gearing up for the announcement of a running mate that could come any time now. George, we don't know when that announcement will be, but as i saw at romney headquarters, there's already a staff in place for that vice presidential candidate. They are working away, though they have no idea who they will be working for. If mitt romney decided tonight, they are ready to go tomorrow? Reporter: They call it a turnkey operation. They ready to go now. Jon karl, thank you. Now, to a heart-stopping

This transcript has been automatically generated and may not be 100% accurate.

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