CARACAS, Venezuela -- Bombs at newspaper offices, threats against reporters, assaults on TV cameramen -- Venezuela's media say they're under siege and that the standard-bearer is none other than President Hugo Chavez. "This is an escalating spiral of aggression, and it's being sponsored by the government," said Miguel Henrique Otero, publisher of El Nacional, one of the country's two top daily newspapers. El Nacional has been the subject of frequent vitriolic tirades by Chavez, as well as boisterous protests and a bomb that shattered a glass door at a sister newspaper, Asi Es La Noticia. Chavez has long engaged in...