Donald Trump committed perjury. Or he looked into the faces of the Republican faithful and knowingly lied. There is no third option. It has become an accepted reality of this presidential campaign that Trump spins a near-endless series of falsehoods. For months, the media has struggled with this unprecedented situation—a candidate who, unlike other politicians who stretch the truth, simply creates his own reality. Trumps regularly peddles “facts” that aren’t true, describes events that never happened or denies engaging in actions that everyone saw him do. He utters his falsehoods so fast that before reporters have the chance to correct one, he has tossed out five or six more. This time, it is different. Trump can’t skip past his perfidy here. There are two records—one, a previously undisclosed deposition of the Republican nominee testifying under oath, and the second a transcript/video of a Republican presidential debate. In them, Trump tells contradictory versions of the same story with the clashing accounts tailored to provide what he wanted people to believe when he was speaking. This fib matters far more than whether Trump was honest about why he abandoned his birther movement or the corollary fib that Hillary Clinton started the racist story that President Obama was born in Kenya. In the lie we are examining here, Trump either committed a felony or proved himself willing to deceive his followers whenever it suits him. Trump told the public version of this story last year, during the second Republican presidential debate. Trump had been boasting for weeks at his rallies that he knew the political system better than anyone, because he had essentially bought off politicians for decades by giving them campaign contributions when he wanted something. He also proclaimed that only he—as an outsider who had participated in such corruption of American democracy at a high level—could clean it up. During the September 2015 debate, one of Trump’s rivals, former Florida Governor Jeb Bush, verified Trump’s claim, saying the billionaire had tried to buy him off with favors and contributions when he was Florida’s governor.…