Liberal denial is a familiar phenomenon. What are the longest liberal denials in history? Here's a growing list:
| Denial | Beginning of denial | Ending of denial | Length of denial |
| Piltdown Man hoax | 1912 | 1953 | 41 years |
| Lenin and Trotsky being as genocidal as Stalin | 1917 | present | 102 years and counting |
| Alger Hiss as a communist spy | 1947 | 1998 | 51 years |
| Joseph Stalin starving millions | 1933 | 1986 | 53 years |
| Population bomb hoax | 1968 | 1987 | 19 years |
| global warming hoax | present | ||
| Effectiveness of supply-side economics | 1975 | present | 44 years and counting |
| How Reagan caused the fall of communism | 1991 | present | 28 years and counting |
| Harm caused by the New Deal during the Depression | 1933 | present | 86 years and counting |
| The falsehood of Charles Darwin's theory of evolution | 1859 | present | 160 years and counting |
| That materialism and evolutionary thought played a role in Hitler's rise to power | 1933 | present | 86 years and counting |
| The racist Southern Democrats did not become Republicans after LBJ reluctantly passed the Civil Rights Act | 1964 | present | 55 years and counting |
(please add)