Bloomberg: Automakers, pushing for a nationwide U.S. auto-emissions standard, buttonholed top Obama administration officials today at the Washington Auto Show to lobby against letting California set its own rules. “Got it,” Carol Browner, the so-called White House energy czar, told Honda Motor Co. Vice President Edward Cohen after he urged against state-set targets. David McCurdy, president of the Alliance of Automobile Manufacturers, said he delivered the same message to Browner, Transportation …