The United Car Employees union endorsed President Biden on Wednesday, delivering an influential increase as he faces a battle in opposition to former President Donald J. Trump to win the help of labor teams.

Mr. Biden, who calls himself the “most pro-union president in historical past,” delighted putting U.A.W. staff however angered auto {industry} executives when he appeared on a picket line with staff final fall. On Wednesday, he appeared in entrance of a nationwide convention of autoworkers to inform them that he had been proud to do it.

“Let me let you know one thing I realized a very long time in the past,” Mr. Biden mentioned. “If I’m gonna be in a battle, I need to be within the battle with you, the U.A.W.”

In earlier remarks, Shawn Fain, the U.A.W. president, advised the gang that Mr. Biden had the monitor report to assist working-class individuals manage for larger wages, higher retirement advantages and well being care.

“This election is about who will arise with us and who will stand in our approach,” Mr. Fain mentioned after a prolonged speech evaluating Mr. Biden’s previous pro-union speeches with Mr. Trump’s lack of help and appearances at nonunion amenities. He referred to as Mr. Trump a “scab” — shorthand for somebody who undercuts the ability of a union, similar to by changing a putting employee.

“If our endorsement should be earned, Joe Biden has earned it,” Mr. Fain mentioned.

The worth of the endorsement, which the U.A.W. delay final 12 months over considerations about Mr. Biden’s dedication to selling union jobs in electric-vehicle manufacturing, could also be much less about persuading members to again Mr. Biden than in motivating them to vote. The union has estimated that solely about 30 p.c of its members supported Mr. Trump in 2016. However with out the union’s formal backing and investments in turnout, Mr. Biden may undergo a drop-off in members who present as much as vote in essential swing states like Michigan.

“Elections aren’t about simply choosing your greatest pal for the job or the candidate who makes you’re feeling good,” Mr. Fain mentioned. “Elections are about energy.”

With Mr. Trump all however locking up the nomination after his efficiency in New Hampshire’s main on Tuesday, officers with the Biden marketing campaign mentioned that the race between the 2 candidates had all however begun.

Whereas onstage, Mr. Biden targeted on highlighting financial vivid spots, together with a powerful job market, decrease gasoline costs and elevated shopper optimism. He additionally in contrast his monitor report to his predecessor’s, saying Mr. Trump is “the one president apart from Herbert Hoover who misplaced jobs when he was president.”

Mr. Fain, a vocal critic of Mr. Trump, didn’t mince phrases. He recalled the 2008 monetary disaster, highlighting Mr. Trump’s anti-union rhetoric then and as a presidential candidate in 2015. Then he recalled Mr. Biden’s feedback, as vice chairman, that the “nation wager on American autoworkers and gained.”

At this, attendees yelled out obscenities about Mr. Trump. “Love the vitality,” Mr. Fain replied.

After the occasion, Mr. Fain advised reporters that the U.A.W.’s board had unanimously accepted the endorsement. He mentioned that Mr. Biden’s financial message was breaking by means of to rank-and-file members, however added that the union would “must do higher” to fight what he mentioned was misinformation about Mr. Biden’s achievements.

Nonetheless, Mr. Fain had made the president work for the endorsement.

Mr. Biden appeared at a number of U.A.W. occasions to show his bona fides with the group’s management and rank and file. In September, Mr. Biden grabbed a bullhorn and joined putting autoworkers in Michigan, turning into the primary sitting president to hitch a picket line in a rare present of help for staff demanding higher wages. When the contract was gained, Mr. Biden wore a pink T-shirt and appeared earlier than celebrating staff in Illinois.

Union officers usually say Mr. Biden has been extra vocal than any president in a long time in backing organized labor. He appeared in a video as Amazon staff in Alabama sought to unionize, warning that “there ought to be no intimidation, no coercion, no threats, no anti-union propaganda.” He additionally referred to as out Kellogg for its plans to completely exchange putting staff. (The strike was resolved earlier than the corporate took that step.)

The U.A.W. was early to help Mr. Biden’s inexperienced vitality insurance policies, however turned pissed off by the dearth of help for unionized auto-industry jobs within the Inflation Discount Act, the main local weather invoice that the president signed in 2022.

Mr. Fain had additionally expressed frustration that the Biden administration had given Ford a $9 billion authorities mortgage to construct three electric-vehicle battery vegetation in Tennessee and Kentucky with none dedication by the corporate to create high-wage union jobs there.

It takes fewer staff to assemble an electrical car than it does to construct one with an inner combustion engine. To make up for these misplaced meeting jobs, the U.A.W. needs to arrange the vegetation that make batteries and different electrical car components which can be being constructed to reap the benefits of the tax incentives included in Mr. Biden’s local weather laws. They’re additionally pushing to increase union organizing to electrical car makers which have lengthy resisted it.

Mr. Biden’s resolution to look on the picket line in Michigan raised the ire of auto {industry} executives, in accordance with officers in his administration, who mentioned that the president was nonetheless decided to clarify the place he stood within the labor battle.

Seeing a gap with the U.A.W.’s rank and file, if not its management, Mr. Trump then made a play for the endorsement, campaigning in opposition to Mr. Biden’s “ridiculous Inexperienced New Deal campaign.” A day after Mr. Biden joined the U.A.W. picket line, Mr. Trump rallied at a nonunion auto components manufacturing facility in Michigan, vying for the help of blue-collar staff.

Mr. Fain had lengthy made it clear his management would by no means endorse the previous president, however endorsing Mr. Biden was nonetheless politically sophisticated. Along with the substantial portion of his membership that’s prone to favor Mr. Trump, the U.A.W. additionally features a vocal liberal bloc that’s skeptical of Mr. Biden. Most of the liberal members are graduate students and college researchers who’ve been essential of the president over his help for Israel throughout its battle in Gaza. The union itself has called for a cease-fire.

Throughout the occasion, a number of protesters waving Palestinian flags have been dragged out by safety officers because the president stored talking, the second time in as many days {that a} Biden marketing campaign occasion has been interrupted by individuals protesting Israel’s marketing campaign in opposition to Hamas in Gaza. Employees chanted “U.A.W.” to drown out their cries.