WASHINGTON — California’s Julie Su faces a fierce, and likely ugly, battle to win confirmation for U.S. Secretary of Labor. Chances are good she’ll win the fight, since 51 senators caucus with the Democrats, and Su won Senate confirmation two years ago as deputy secretary. But Su, who ran the California department that managed the state’s beleaguered unemployment system during the COVID-19 pandemic, faces tough questions. President Joe Biden nominated her last week to replace Marty Walsh, who’s leaving to become executive director of the National Hockey League Players’ Association. “I really f...