Associated Press New York Mayor Michael Bloomberg left the Republican Party on Tuesday and switched to unaffiliated, a move certain to be seen as a prelude to an independent presidential bid that would upend the 2008 race. The billionaire former CEO, who was a lifelong Democrat before he switched to the Republican Party in 2001 for his first mayoral run, said the change in his voter registration does not mean he is running for president. "Although my plans for the future haven't changed, I believe this brings my affiliation into alignment with how I have led and will continue to...