How sleazy is Roger Stone? After the on-again, off-again Trump operative was arrested last week and charged in connection with special counsel Robert Mueller’s investigation, news reports invariably brought up Stone’s boasts that he and Richard Nixon were thisclose. Once again, we were subjected to those appalling photos of the Nixon tattoo that adorns Stone’s back. And the Nixon Foundation sprung into action on Twitter:

When even an organization devoted to “the consequential legacy and relevance” of the original unindicted co-conspirator wants nothing to do with you, it may be safely assumed that you are no ordinary political dirty trickster. And surely no one would call Stone ordinary.

What we should call Stone is the man who, more than anyone else, inflicted the presidency of Donald Trump upon us. It is easy to dismiss Stone as a foppish buffoon. But in rewatching the Netflix documentary “Get Me Roger Stone” this week, I was reminded of how crucial Stone was to the entire Trump political enterprise — starting in the late 1980s, when Trump visited New Hampshire at Stone’s instigation.

“The Trump candidacy was a pure Roger Stone production,” says Jeffrey Toobin, who wrote a profile of Stone for The New Yorker and is one of the principal talking heads in the 2017 film, directed by Dylan Bank and Daniel DiMauro.

By Stone’s own telling, his dirty tricks extend all the way back to elementary school, where he rigged a mock election between his candidate, John F. Kennedy (Stone was not yet a Republican), and Richard Nixon.

“I went to the cafeteria, and as each kid would go through the cafeteria line with their tray, I would tell them, ‘You know, Nixon has proposed having school on Saturdays,’” Stone recalls. “Well, then the mock election was held, and to the surprise of the local newspaper, Democrat John Kennedy swept this mock election. For the first time ever, I understood the value of disinformation.” With a slight smirk he adds, “Of course, I’ve never practiced it since then.”

Stone has somehow managed to convince himself that he has political convictions that go beyond notoriety and cashing in. Yes, at one point we learn that he holds libertarian views on issues such as reproductive choice, same-sex marriage, and the legalization of marijuana. What really motivates him, though, are the same inchoate resentments that have helped elect the Republican presidents he’s served.

“Those who say I have no soul, those who say I have no principles, are losers. Those are bitter losers,” he says, sitting in a limousine in a pinstriped suit, wearing a lavender hat and his trademark round dark glasses. “Everything I have done, everything I have worked for, is to propel ideas and a political philosophy that I want to see dominate in government. Donald Trump has now elevated the issues that I believe in: anti-elitism that was first identified by Richard Nixon, mined by Ronald Reagan, and now Donald Trump.”

Anti-elitism as a “political philosophy.” Well, it carried Trump to the presidency, and it continues to resonate with his base. In Stone’s world, as in Trump’s, winning is its own justification.

The range of dirty tricks attributed to Stone, often exaggerated by the man himself, is breathtaking. Arranging for a campaign donation from a phony socialist group to Pete McCloskey, Nixon’s 1972 Republican primary opponent. Destroying Pat Buchanan’s 2000 presidential campaign by means too complicated to explain here (Trump played a cameo), thus helping to ensure the election of George W. Bush. Instigating the “Brooks Brothers Riot” that stopped the 2000 Florida recount. Breaking the Eliot Spitzer prostitution scandal. Possibly even supplying CBS News with the George W. Bush National Guard documents that led to the departure of several journalists from the network, including anchor Dan Rather, after they were shown to be fake.

Toobin again: “Roger is unique in my opinion because he embraces infamy. He doesn’t worry that you’ll think he’s a sleazeball. He wants you to think he’s a sleazeball.”

Among other things, “Get Me Roger Stone” demonstrates that the Trump campaign had its origins many years ago, tying together such nefarious figures as Roy Cohn, Paul Manafort, Stone, and Trump himself. Trump and Manafort spoke extensively to the filmmakers, with Manafort saying, “Roger’s relationship with Trump has been so interconnected that it’s hard to define what’s Roger and what’s Donald.”

It seems likely that Stone would have been regarded as more of a real player and less of a sideshow freak if he hadn’t gotten caught up in a sex scandal of his own while working for Bob Dole’s 1996 presidential campaign, thus relegating him to the shadows. Indeed, in the film we see Stone in such ridiculous situations as yelling into a megaphone while wearing a Shepard Fairey-style T-shirt of Bill Clinton emblazoned with the word “Rape” and holding forth on Alex Jones’ conspiracy-mongering “Infowars” program.

Roger Stone may come across as an absurd character. But as the film makes clear, he’s also one of the most important political operatives of the past four decades. As “Get Me Roger Stone” winds down to its conclusion, his unseen interlocutor asks, “What message would you have for the viewers of this film who will loathe you when the credits roll?” Stone’s answer: “I revel in your hatred. Because if I weren’t effective, you wouldn’t hate me.”

WGBH News contributor Dan Kennedy’s blog, Media Nation, is online at dankennedy.net.