Earlier than the 2016 election, J.D. Vance referred to as Donald J. Trump “cultural heroin” and a demagogue who was “main the white working class to a really darkish place.”

On Tuesday, Mr. Vance’s triumph in a crowded Republican area for Senate in Ohio was thanks largely to an endorsement, late within the race, from the previous president he as soon as denounced.

The conversion of Mr. Vance, an writer and enterprise capitalist, from Trump skeptic to full-on Trump ally may fill a second memoir, a sequel to his best-selling “Hillbilly Elegy,” Mr. Vance’s story of rising up poor in Kentucky and Ohio. When that ebook was revealed in 2016, it was devoured by the “coastal elites” he now rails in opposition to as a way for them to decode white working-class assist for Mr. Trump.

Mr. Vance’s ebook pointed inward to clarify the woes of his neighborhood: He blamed a private “lack of company” for drug abuse, welfare dependency and chaotic lives. However as a politician, he has pointed the finger outward, at exterior enemies, simply as Mr. Trump did.

On the marketing campaign path, Mr. Vance blamed firms for delivery jobs to China and accused liberals of opening borders to low-cost labor and opioid traffickers. The intimate voice of “Hillbilly Elegy” yielded to a darker tone and language. He castigated “idiots” in Washington and “scumbags” within the information media.

His critics, together with Republican rivals in Ohio, stated he had turned himself inside-out to imitate Mr. Trump’s bellicosity in pursuit of votes. Opponents spent hundreds of thousands on assault adverts to remind voters that Mr. Vance had as soon as referred to as himself “a By no means Trump man” and had stated some voters backed Mr. Trump “for racist causes.”

Mr. Vance, on a slog throughout Ohio he referred to as the “No B.S. City Corridor Tour,” defined to modest crowds that he had undergone a political evolution, recognizing that Mr. Trump was proper on problem after problem.

“I used to be like, ‘Man, , when Trump says the elites are essentially corrupt, they don’t care in regards to the nation that has made them who they’re, he was really telling the reality,’” he advised a conservative podcaster final yr.

In the present day, Mr. Vance, who graduated summa cum laude from Ohio State College and went on to Yale Legislation Faculty, has discovered a political residence with the motion referred to as nationwide conservatism, an effort so as to add an mental framework to Trumpism. Nationwide conservatives lean proper on points like range and immigration restrictions however lean left on economics, opposing unfettered free commerce, particularly with China.

Mr. Vance, 37, grew up in Middletown, Ohio, the place a grandfather had moved from Kentucky for a metal mill job. Within the years after J.D. Vance was born in 1984, town hollowed out as blue-collar jobs left, opioids arrived, marriages dissolved and far of the economic Midwest grew to become “a hub of distress” for the white working class, he wrote in his memoir.

Mr. Vance’s mom, Bev, struggled with drug habit. He was raised largely by his maternal grandparents, notably the grandmother he referred to as Mamaw, who “beloved the Lord,” “beloved the F-word” and owned 19 handguns, he stated on the marketing campaign path.

Out of highschool, Mr. Vance enlisted within the Marines and served in Iraq as a public affairs officer. He returned residence a person in a rush, crusing by Ohio State in below two years.

At Yale, he met a fellow pupil he would marry, Usha Chilukuri, who went on to clerk for an appeals courtroom choose, Brett M. Kavanaugh. Democrats’ fierce opposition to Mr. Trump’s nomination of Decide Kavanaugh to the Supreme Court docket in 2018 seemed to be a turning level in Mr. Vance’s political transformation.

“Trump’s reputation within the Vance family went up considerably through the Kavanaugh struggle,” he recalled in 2019.

Mr. Vance went to work as a enterprise capitalist in San Francisco for Peter Thiel, a billionaire founding father of PayPal, whom he had heard converse at Yale. Mr. Thiel, a Silicon Valley conservative, additionally influenced Mr. Vance’s politics, particularly his opposition to China and to immigration.

When Mr. Vance moved his household, which now consists of three youngsters, again to Ohio, he raised cash from Mr. Thiel for a enterprise capital fund of his personal — and adopted the Thiel custom by naming the enterprise, Narya Capital, with a “Lord of the Rings” reference.

Mr. Thiel poured $13.5 million right into a political motion committee to assist Mr. Vance’s race.

As a candidate, Mr. Vance had struggled to translate celeb as an writer into broad recognition and assist from the Republican base. He was perpetually operating behind his rivals in polling, and Mr. Thiel’s hundreds of thousands have been almost gone.

However all that rotated with Mr. Trump’s endorsement on April 15. Many of the Republican area had aggressively auditioned for the previous president’s seal of approval. Mr. Vance first pitched Mr. Trump at a gathering at Mar-a-Lago brokered by Mr. Thiel. Donald Trump Jr. and the Fox Information host Tucker Carlson additionally lobbied for Mr. Vance.

“J.D. Vance might have stated some not so nice issues about me previously,” Mr. Trump stated in saying his selection, “however he will get it now, and I’ve seen that in spades.”