Those close to Mr. Bloomberg said the 65-year-old billionaire is considering a White House bid, despite his repeated denials. Moreover, friends and advisers said, developments make a candidacy more conceivable Shifts atop the polls for both parties in early-voting states suggest uncertainty among some voters about the current crop of candidates, while an increasingly nasty campaign could badly bruise whomever comes out on top, Mr. Bloomberg's supporters said. Gridlock in Congress could open the door for Mr. Bloomberg's nonpartisan message. At the same time, national polls show voters worrying more about the economy and less about Iraq -- a trend...
