Two House Democrats have been ousted by their Republican challengers in Pennsylvania, bolstering the GOP’s chances of defending its slim majority as it inches closer to the 218-seat threshold. Republican candidate Ryan Mackenzie defeated three-term ...

Republicans picked up two more hard-fought seats Thursday in Pennsylvania, which became a stark battlefield of Democratic losses up and down the ticket.

Democrats’ path to retake control of the House of Representatives got slimmer as more races were called on Wednesday and Thursday. The party needs a net gain of four seats in order to win back the majority in Congress’ lower chamber.

Though Republicans seized control of the presidency and the Senate Tuesday night, Democrats have held onto the prospect of a majority in the House—but now that hope, too, is slipping. While it’s still technically possible,