WASHINGTON – Speaker Nancy Pelosi on Wednesday urged party unity amid Bernie Sanders’ surge in the presidential race, even as House Democrats worry about a volatile election season that could put a self-described democratic socialist atop the ticket and threaten their majority. “I would hope that everyone would say, no matter who the nominee is for president, we wholeheartedly embrace that person,” Pelosi, D-Calif., told the House Democratic caucus at a closed-door meeting.