Among the reasons that Al Gore was never President of the United States was that a lot of people thought he was a "congenital liar" because of a confusion over the popular novel, Love Story by Erich Segal. Wikipedia's description of this confusion syncs up with what I remember hearing at the time…
It is sometimes said that Al Gore falsely claimed that the plot is based on his life at Harvard. In fact, Al Gore mentioned correctly, that he had read that the characters were based on him and his wife. In 1997, Segal confirmed Gore's account, explaining that he had been inaccurately quoted in the Nashville Tennessean and that "only the emotional family baggage of the romantic hero was inspired by a young Al Gore. But it was Gore's Harvard roommate, Tommy Lee Jones, who inspired the half of the character that was a sensitive stud, a macho athlete with the heart of a poet." Erich Segal had met both Jones and Gore at Harvard in 1968, when he was there on sabbatical. Jones would go on to appear in a supporting role in the film adaptation of the novel.
In other words, Gore didn't lie — or if he did, it was about something pretty trivial — but if you were against his candidacy, you could probably spin the confusion that way, lying to say he'd told The Lie of the Century. That did him some real damage to the man as did a similar twisting of a statement he uttered that made it sound like he was claiming he alone created The Internet.
That wasn't so long ago and I'm amazed at how it is now possible for You-Know-Who to lie openly about matters of substance and not lose the support of the kind of voter who was appalled at Gore's supposed mendacity. Here's a link to Fred Kaplan writing about some of the lies in Trump's speech at the Republican National Convention.
And while we're at it, here's a link to Politifact's fact check of that speech, here's a link to a long CNN fact check, here's a link to the Washington Post fact check, here's a link to the Associated Press fact check and here's a link to the New York Times fact check. You may notice a lot of repetition but no one caught them all.