Joe Biden, the famous Puerto Rican, Jewish, Truck Driver, who helped Golda Meir free Mandela, does not know he is lying. Biden believes his lies are real. He has had a psychological condition for his entire career known as Costanza Syndrome. In Joe Biden's mental world, if he 'believes' a situation to be true, then for him internally it becomes truth. This covers not only his constant tall-tales (lies), but also his long history of plagiarism.
I wrote that! Of course I did. If someone else wrote the same thing before me well, that is just a coincidence. Joe Biden does not know he is lying. In his weird mind, he is telling the truth. He simply lacks the ability to distinguish truth from fantasy.
Biden would pass a lie detector.