The left has for some time been decrying the "disease of false equivalence"
-- particularly the idea that the pure-as-the-driven-snow liberals could ever behave as heinously as your average knuckle-dragging conservative.
The former in essence accuses Romney personally of permitting a woman to die of cancer -- without a single fact to support it. The latter criticizes the sitting President on a disputed matter of policy where reasonable opinions may differ. Some say it is accurate
; others disagree
. But no one can credibly defend the Obama SuperPac's claims about Romney's tenure at Bain causing Joe Soptic's wife to die of cancer.
The SuperPac reaches a new low for political attack ads, and the President's campaign has been caught lying about their knowledge of it. The Romney ad is pretty much a standard (if controversial) political attack ad.
There is no equivalence. And those who try to equate the two ads are, consciously or not, displaying a real pro-Obama bias -- and contributing to a massive degradation of political discourse in presidential campaigns.