[Dagnabitt]

Any evidence for this wild claim ?

[Diogenesis]

It was a question, not a claim, based upon Romney's
history of dispicable behavior.

As but one example:
"....John McCain rightly did not like Romney's tactics during the primaries.
(W)hen (Romney's early leads) started slipping away, he resorted to unfair,
distorted, scorched-earth negative ads, betting that his opponents couldn't
afford to spend enough for the truth to catch up to his charges."
[Romney: A Mistake for McCain, 7/23/2008, Dick Morris]