Dan Janison Melville. N.Y. Tuesday January 26, 2010. Daniel Janison,

Dan Janison has been a reporter at Newsday since 1997.

Old scandals always bring new ammunition in a national election.

Donald Trump has already called Hillary Clinton an “enabler” for her husband’s lies and indiscretions.

Clinton’s campaign stockpiles instances of Trump’s misogyny and use of fake names.

They’ve only just begun.

In the next few days, a documentary called “Weiner” will open. The film gives an eyewitness view from 2013 of what was going to be former Rep. Anthony Weiner’s comeback mayoral run — which turned instead into another sad and silly episode for him.

Weiner’s wife, Huma Abedin, a close, longtime aide to Secretary of State Clinton, who now serves as vice-chair of her latest campaign, gets caught in the headlights as the Queens congressman’s latest sexting lie is exposed. Her humiliation already has been compared to that of her boss in the 1990s.

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The hype has been intense. Months ago, The Hollywood Reporter said the film editors deleted scenes of a Clinton team member urging Abedin to dump Weiner.

Remember, though, that Weiner was also a big Clinton booster in 2008 and even went to Ohio in the campaign’s waning stages to do TV standups in her favor.

In September, Trump weighed in and called Weiner a “perv sleazebag,” with access to State Department information through Abedin.

And in December, after Trump proposed banning Muslims from the U.S., Abedin made a rare public appeal — in a fundraising pitch for Clinton.

“I’m a proud Muslim,” she wrote, “but you don’t have to share my faith to share my disgust.”

As New York values go, this is also a tale of feuding members of the city’s power elite. Anyone interested already knows the Clintons were guests at Trump’s 2005 wedding. Less known is that Abedin has told reporters she is a good personal friend of Trump’s daughter Ivanka.

Expect more from this reality-show soap opera when the “Weiner” film debuts.

In 2012, former Rep. Michelle Bachmann, a serial fabulist from Minnesota, contrived a weird and debunked theory linking Abedin, a daughter of South Asian Muslims raised in Saudi Arabia, to the Muslim Brotherhood.

Even Sen. John McCain (R-Ariz.) condemned the claim as having “no logic, no basis and no merit.”

False though it appears, you can expect to hear that one again.

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After all, Trump suggested without evidence the day of the Indiana primary that Ted Cruz’s father was once pictured with Lee Harvey Oswald, the assassin of President John F. Kennedy.

Old Karl Marx seems to have gotten it wrong when he said history repeats itself, first as tragedy and then as farce.

This time, farce seems to be the prelude, with the main event still to come.