The New York Observer, a publication owned by Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE's son-in-law, on Tuesday endorsed Trump for president in an editorial.

The paper claimed the publisher's relationship was not the reason for the endorsement.

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"Donald Trump is the father-in-law of the Observer’s publisher," the editorial said. "That is not a reason to endorse him. Giving millions of disillusioned Americans a renewed sense of purpose and opportunity is."

The paper's endorsement slammed the media and the professional political class, saying both groups have tried to make "excuses and rationales" for Trump's success.

"Their opinions have become increasingly irrelevant. For in the 10 months since Mr. Trump’s campaign announcement, their 'insights' have been uniformly wrong and their influence has dwindled," it said.

Trump's popularity has been propelled by the "media and cultural elite's inability to grasp the profound alienation, anger and disillusionment of millions of Americans," the newspaper added.

"The media’s enthusiastic embrace of the Obama narrative — that America should be willing to accept a dimmer future — has blinded it to the appeal of the Trump candidacy, and of an alternative, more compelling narrative."

The editorial touted the high vote totals in the Republican primaries, saying they prove people believe America can be "great again," the billionaire candidate's campaign slogan.

It also addressed some of Trump's "less successful ventures," including Trump University and Trump Airlines.

"Having tried (and sometimes failed) at our own entrepreneurial ventures, we are far more inclined to put these ventures into perspective. As Robert Kennedy said, 'Only those who dare to fail greatly can ever achieve greatly,' " it said.

"We have a suggestion for a Republican establishment dismayed by this unlikely candidate’s unlikely success: instead of monomaniacally focusing on tearing him down, those who care about the future of the party should reach out to Mr. Trump and help him grow as a candidate and a leader," it said.

"In 1980 Ronald Reagan said, 'The time is now for strong leadership,' and by 1984 was able to declare, 'It is morning again in America.' Today, Donald Trump says it is time to make America great again. We agree."

The New York Times reported earlier this month that the Observer's editor had helped Trump prepare his speech to the American Israel Public Affairs Committee.

But the editor has since vowed to stop giving "input" to Trump's presidential campaign, the report said.

The publication's political editor told the Times it will cover the race "as fairly as possible despite the unavoidable conflict of interest created by our ownership."