http://mediamatters.org/research/2015/12/22/the-king-of-whoppers-fact-checkers-call-out-don/207656
"Fact checkers ended 2015 by calling out Donald Trump's endless "political falsehoods," noting that the GOP presidential frontrunner "stands out not only for the sheer number of his factually false claims, but also for his brazen refusals to admit error when proven wrong"."
