Governor Mitt Romney will announce at 6 p.m. that he will not seek re-election to a second term, setting the stage for an expected campaign for the 2008 Republican presidential nomination, a senior aide to the governor said today. The aide told the Boston Globe that Romney will announce that he will fill out his term, which ends in January, 2007. The move is widely seen as another step in his plans to launch a presidential campaign. His announcement today is expected to be televised live from the State House. The 58-year-old businessman, son of former Michigan Gov. George Romney,...