John Fetterman: The left-leaning Pennsylvania politician in gym clothes.

PITTSBURGH — John Fetterman, the liberal lieutenant governor of Pennsylvania who received his state’s Democratic nomination for Senate on Tuesday, appeared to be cruising into what is shaping up as just one of the most intently viewed common elections in the place this slide. Then a stroke upended his programs.

Mr. Fetterman, the 6-foot-8, hoodie-carrying former mayor of Braddock, Pa., was not a most loved of the bash institution, but he electrified some progressive voters and a broader slice of the Democratic voters that embraced his blunt-spoken, obtainable model and welcomed his pledges to battle aggressively for occasion priorities in Washington.

“I’m just carrying out my thing,” he stated in an job interview previous 7 days. “I’m just a dude that exhibits up and just talks about what I believe that in, you know?”

After canceling marketing campaign functions on Friday, Saturday and Sunday, Mr. Fetterman, 52, announced that he had experienced a stroke, was recovering and experienced not suffered any cognitive hurt.

He was continue to in the clinic on Tuesday, when his marketing campaign declared that he would endure “a conventional treatment to implant a pacemaker with a defibrillator,” incorporating, “It need to be a brief method that will assist guard his coronary heart and deal with the underlying result in of his stroke.”

It was unclear when he would be in a position to resume campaigning.

The well being scare carried ramifications significantly outside of Pennsylvania. Democrats maintain a the greater part in the Senate only by advantage of Vice President Kamala Harris’s tiebreaking vote. The party’s vulnerability had previously been highlighted when Senator Ben Ray Luján of New Mexico suffered a stroke in January.

It also seemed jarring provided Mr. Fetterman’s vigorous community impression he typically was dressed as if he’d just remaining the health and fitness center.

“He might not search like a Senate candidate for New York or California, but he’s just great for Pennsylvania,” stated Ed Rendell, a Democratic former governor of the condition. “He’s a extremely plausible candidate for the functioning course.”

Mr. Fetterman, who holds a diploma from the Harvard Kennedy College, served for 13 a long time as the mayor of Braddock, where he captivated consideration for his attempts to revitalize a struggling metal city — and scrutiny over a 2013 episode in which he brandished a shotgun to cease an unarmed Black jogger, telling the law enforcement he had read gunshots.

He ran unsuccessfully for the Senate in 2016 but attained an enthusiastic adhering to, and went on to defeat an incumbent to win his party’s nomination for lieutenant governor in 2018. In that part, he managed an lively existence all over the condition, developing name recognition that played an significant part in his key victory.

“He spent a ton of time in communities through the condition,” said Senator Bob Casey of Pennsylvania, who did not take sides in the primary. “That’s something he’s been in a position to develop on.”

Mr. Fetterman also made a title for himself in national progressive circles, receiving the endorsement of Senator Bernie Sanders of Vermont in 2018 after he backed Mr. Sanders’s 2016 presidential main bid. And he acquired refreshing prominence with a broader vary of voters as a cable-television fixture when Pennsylvania’s 2020 votes were becoming counted.

Many months later, he entered the Senate principal, the very first key Democratic prospect to bounce into the race, and cemented an too much to handle fund-elevating gain above his nearest rivals.

Mr. Fetterman campaigned on challenges like raising the minimal wage, advertising and marketing felony justice reform and supporting voting legal rights, abortion legal rights and protections for L.G.B.T.Q. folks.

But he captivated just as substantially interest for his style, and some saw him as proficient at connecting with blue-collar voters. He favored basketball shorts and sweatshirts around button-downs and khakis and spent considerable time campaigning in rural, operating-course counties that had overwhelmingly voted for former President Donald J. Trump, hoping to strengthen Democratic margins in all those areas.

Mr. Fetterman has frequently described himself as a progressive in the past, but in the Senate race he did not seek the still left-wing mantle. He rejected a recommendation very last week that he would be part of the “Squad,” a team of left-wing associates of Congress, should really he get.

Republicans and some Democrats, nevertheless, feel that he might be vulnerable to criticism that he is way too considerably to the remaining for just one of the most intently divided states in the nation, and primarily for its much more centrist suburbs, which have been critical to the latest Democratic gains in the point out.

“It’s good that Fetterman is likely to these areas wherever Democrats have finished badly in these Republican counties, but I believe his even bigger problem is going to be these suburban communities,” reported former Consultant Charlie Dent, a Pennsylvania Republican who stated he experienced voted for President Biden.

Mr. Dent warned that Mr. Fetterman is viewed by some as a “Bernie Sanders Democrat.”

The lieutenant governor life in Braddock with his a few small children and his spouse, Gisele Barreto Fetterman, the next girl of Pennsylvania, who has embraced the acronym “SLOP” and who, like Mr. Fetterman, has an energetic social media presence.

She insisted that he get checked out soon after sensation unwell on Friday, the Fettermans reported.

His campaign claimed Monday that Mr. Fetterman experienced been “again evaluated by the neurologist who the moment again reiterated that John will make a full restoration.”