WASHINGTON (AP) - In a major win Wednesday for Democrats, John Fetterman defeated Republican Dr. Mehmet Oz in Pennsylvania, flipping a highly competitive Senate seat and sustaining the party’s hopes of maintaining control of the upper chamber.

Fetterman had faced questions about his fitness for office after suffering a stroke just days before the state’s primary, but nonetheless bested Oz in a major rebuke to former President Donald Trump, whose endorsement helped Oz win his competitive primary. The win gives Democrats breathing room as they seek to maintain their narrow control of the Senate and the House remains to early to call.

“I’m so humbled,” Fetterman, wearing his signature hoodie, told his supporters early Wednesday morning. “This campaign has always been about fighting for everyone whose ever been knocked down that ever got back up.”

The results were part of a broader show of strength as Democrats repelled a series of Republican challengers in closely watched contests for Congress and governor’s mansions. Ultimately, control of Capitol Hill was unclear as votes were still being counted.

Democrats kept seats in districts from Virginia to Kansas and Rhode Island, while many districts in states like New York and California had not been called.

Rep. Kevin McCarthy, poised to be House speaker if the GOP takes control of the chamber, was optimistic the GOP would take control, saying, “When you wake up tomorrow, we will be in the majority.” Democratic House Speaker Nancy Pelosi said, “While many races remain too close to call, it is clear that House Democratic Members and candidates are strongly outperforming expectations.”