The Obama political machine’s race to the bottom has dived deep beneath the muck of Harry Reid’s lies about Romney’s taxes and finally hit bedrock. Today Priorities USA released a new ad that will surely rank among the ugliest and most dishonest in the history of political campaigns. Titled “Understands” the ad features Joe Soptic describing how Mitt Romney is responsible for his wife’s death from lung cancer. It’s Lyndon Johnson’s Daisy ad made more personal and therefore even more vile.

Romney’s campaign was quick to blast the commercial. “President Obama’s allies continue to use discredited and dishonest attacks in a contemptible effort to conceal the administration’s deplorable economic record,” said spokesman Ryan Williams. “After 42 months of unemployment above 8 percent, it is clear that the President and his campaign do not have a rationale for reelection.”

The ad will air in the key battleground states of Florida, Iowa, Ohio, Pennsylvania and Virginia and is part of a $20 million ad campaign by Priorities hammering Romney.

Soptic appeared previously in an Obama campaign ad that aired in battleground states in which he blasted Romney, saying Bain’s closure of the GST Steel plant had cost workers their pensions.

GST Steel was purchased by Bain Capital in the 1990s and went bankrupt in 2001. The plant’s workers were fired and lost their jobs and benefits.

Romney’s campaign has said the presumptive nominee was not involved in the decision to close the plant and had left Bain to manage the Salt Lake City Winter Olympics.

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