As she struggles to blunt Barack Obama's growing momentum, Democrat Hillary Clinton shuffled her campaign staff's leadership on Sunday ahead of this week's US presidential nominating contests, while her rival celebrated a victory in the Maine caucuses.
Clinton replaced her campaign manager after a string of losses on Saturday, though aides played down any notion the move was a sign of trouble for the New York senator in her tight state-by-state fight with Obama to be the Democratic nominee for the November 4 election.