In all the different ways that Mr. Trump has upended the traditional rules of American politics, that may be one of the most striking. He has survived more scandals than any major party presidential candidate, much less president, in the life of the republic. Not only survived but thrived. He has turned them on their head, making allegations against him into an argument for him by casting himself as a serial victim rather than a serial violator.

His persecution defense, the notion that he gets in so much trouble only because everyone is out to get him, resonates at his rallies where he says "they're not coming after me, they're coming after you, and I'm just standing in the way." But that of course belies a record of scandal stretching across his 78 years starting long before politics. Whether in his personal life or his public life, he has been accused of so many acts of wrongdoing, investigated by so many prosecutors and agencies, sued by so many plaintiffs and claimants that it requires a scorecard just to remember them all.

His businesses went bankrupt repeatedly and multiple others failed. He was taken to court for stiffing his vendors, stiffing his bankers and even stiffing his own family. He avoided the draft during the Vietnam War and avoided paying any income taxes for years. He was forced to shell out tens of millions of dollars to students who accused him of scamming them, found liable for wide-scale business fraud and had his real estate firm convicted in criminal court of tax crimes.

He has boasted of grabbing women by their private parts, been reported to have cheated on all three of his wives and been accused of sexual misconduct by more than two dozen women, including one whose account was validated by a jury that found him liable for sexual abuse after a civil trial.

He is the only president in American history impeached twice for high crimes and misdemeanors, the only president ever indicted on criminal charges and the only president to be convicted of a felony (34, in fact). He used the authority of his office to punish his adversaries and tried to hold onto power on the basis of a brazen lie.

Mr. Trump beat some of the investigations and lawsuits against him and some proved unfounded, but the sheer volume is remarkable.

His business career vaulted him to fame, and he had notable successes, perhaps most prominently the rehabilitation of the Commodore Hotel and the construction of Trump Tower. But he often reached further than he was able to deliver. His record in business was pockmarked with plenty of failures.

The Trump Shuttle airline? Failure. His dreams of building a Television City in Manhattan? Failure. A United States Football League franchise? Failure. The Trump Plaza Hotel and Casino, Trump Taj Mahal, Trump's Castle Casino Resort, Trump Mortgage, Trump Vodka, Trump University, Trump Steaks, GoTrump.com? All failures.

His most spectacular flameouts came in the gambling mecca of Atlantic City, where he overextended himself building or buying three casinos that ultimately cannibalized each other's clientele as he failed to keep up with enormous debt payments. He filed bankruptcy for the Taj Mahal in 1991 and then for the other two casinos in 1992. He also filed bankruptcy in 1992 for the Plaza Hotel.

Even after recovering from that debacle, Mr. Trump failed again. His casino company filed for bankruptcy in 2004 and then again in 2009, for his sixth trip into that process. In his various bankruptcies, he was compelled to sell assets, and creditors were forced to write off some of his debt. But Mr. Trump has boasted that he still made money in Atlantic City even after leaving a trail of losses for nearly everyone else involved, including workers who lost jobs.

Mr. Trump played the game along the edge, and sometimes over the line, of propriety. To grease his path, he would hire a governor's son or a federal prosecutor's brother. Along the way, he was investigated time and time again. Federal, state and local authorities looked into his ties with the Mafia, found violations of money laundering laws and penalized him for skirting stock trade rules.

At one point when Mr. Trump was strapped for cash to make an interest payment, his father sent a lawyer to one of the son's casinos to buy $3.5 million in chips without placing a bet. New Jersey's casino regulators imposed a $65,000 fine for what amounted to an illegal loan.

But Mr. Trump makes a point of not admitting misdeeds or mistakes. Even his failures he portrays as triumphs. "I made a lot of money in Atlantic City," he once said, "and I'm very proud of it."