** FILE ** New York Mayor Michael Bloomberg, left, and U.S. Sen. Hillary Rodham Clinton, D-N.Y., appear together before the start of an early St. Patrick's Day parade in the Queens borough of New York, in this March 3, 2002 file photo. Bloomberg enjoyed a friendly relationship since he was elected to City Hall during Clinton's first year as New York's junior senator but that can change should Bloomberg enter the race for the White House as an Independent and challenge Clinton, who has already declared her candidacy for the Democratic nomination. (AP Photo/Tina Fineberg, File)