A wave of pipe bombs was sent to prominent Democratic politicians, including former President Barack Obama and former Secretary of State Hillary Clinton, sparking an intense investigation on Wednesday into whether a bomber is going after targets that have often been the subject of right-wing ire. CNN also received a similar bomb, addressed to Mr. Obama’s C.I.A. director John Brennan, touching off a mass evacuation of the Time Warner Center in Midtown Manhattan, where the network is located. A law enforcement official said the devices were similar to one found Monday at the home of George Soros, the billionaire ... (full story)