Here is Norm Ornstein of the conservative think tank, American Enterprise Institute:
“I think there’s nobody like Romney,” says Ornstein. “Romney is like the Michael Phelps of presidential candidates. If you’re looking for gold medals in terms of audacious lying, and adamant refusal to turn over personal information, nobody comes close. I’m sure others would’ve liked to have done it, but the culture in the past was one where lying attracted some level of approbation and shame.”
What is outstanding here is not the observation, but the source, a respected observer of politics at a conservative think tanks. For a catalog of Romney's lies see Steve Benen's series at Maddowblog, Chronicling Mitt's Mendacity, now up to installment forty!