WASHINGTON (Reuters) -President Joe Biden drew loud applause at a labor event on Wednesday when he turned a spotlight on Amazon.com Inc while touting his administration’s efforts to promote unions. After highlighting a government task force on worker organization he launched a year ago “to make sure the choice to join a union belongs to workers alone,” Biden called out the online retail giant, whose own workers at a New York City warehouse voted last week to unionize. “And by the way, by the way, Amazon here we come. Watch. Watch,” he said during a speech to the North America’s Building Trades…