Obama buys airtime on networks for anniversary of Black Tuesday in 1929 By MARGARET TALEV McClatchy Newspapers Barack Obama is buying a half-hour slot on television networks in prime time Oct. 29, the anniversary of Black Tuesday of 1929, when panic in the stock markets set in ahead of the Great Depression. Obama, leaving a campaign stop in a diner in Georgetown, Ohio, on Thursday evening, declined to say whether he plans to address the current economic crisis in the context of the depression. He wouldn’t talk about the nature of the programming, saying, "We’re going to be talking about...