CNN AIRS BUSH REHEARSAL LIVE; NETWORK CALLS 'MISTAKE'Mon May 15 2006 20:37:17 ET CNN aired President Bush rehearsing his immigration speech from the Oval Office on Monday night! The embarrassing images and audio [16 seconds total] captured the president starting and stopping his message, then looking at the White House media advisor for direction. [Click for video capture] "The president is rehearsing and the network pool inadvertently went to the president as he is rehearsing," anchor Wolf Blitzer explained. The development comes just six months after CNN mistakenly placed a bold black 'X' mark over Vice President Cheney's face...