BERLIN (AFP) - German Chancellor Angela Merkel has slammed a request by Barack Obama to give a speech this month before the Brandenburg Gate as inappropriate, her deputy spokesman said Wednesday. The conservative leader said that while she would be pleased to meet the US Democratic presidential hopeful, it would be wrong for him to hold a "campaign rally" at the historic symbol of German unity. "It is unusual to do electioneering abroad," spokesman Thomas Steg told reporters. "It is unusual to hold election rallies abroad. No German candidate for high office would even think of using the National Mall...