PITTSBURGH — John Fetterman, the liberal lieutenant governor of Pennsylvania who won his state’s Democratic nomination for Senate on Tuesday, seemed to be cruising into what is shaping up as one of the most closely watched general elections in the country this fall. Then a stroke upended his plans.
Mr. Fetterman, the 6-foot-8, hoodie-wearing former mayor of Braddock, Pa., was not a favorite of the party establishment, but he electrified some progressive voters and a broader slice of the Democratic electorate that embraced his blunt-spoken, accessible style and welcomed his pledges to fight aggressively for party priorities in Washington.
“I’m just doing my thing,” he said in an interview last week. “I’m just a dude that shows up and just talks about what I believe in, you…