1988:
Biden plagiarized a speech by Neil Kinnock and claimed his grand pappy was a coal miner. Wash Post fact-checked it to be a lie, the grand pappy was not a coal miner at all - none of his past families had ever worked as a coal miner.
After the failed presidential nominee campaign, he went on to John Stewart's show and admitted that it was nothing but lies...
May 2021:
Again, he utter the same lie that his grand pappy was a coal miner.
Once a liar, always a liar... but if you lie enough, you actually believe your lies to be true.