The Obama Campaign ran an add in Ohio for months before Romney even bothered to respond saying that Mitt Romney was responsible for the death of a woman who lost her job and got cancer.
When the woman in question was laid off Romney had already left Bain Capital and it was being ran by an Obama Campaign Co-Chair, it is he who laid her off.
The woman in question was able to carry over her insurance and was in fact insured, not uninsured.
The entire ad from Obama was a big fat lie, and what was the response of the Romney Campaign and Andrea Saul who ran communications for Romney, "she should have lived in Massachusetts".
This is how elections are lost, and this is how far politicians will go to lie to people.