Tony Blair may have secured a historic third term for the Labour Party last night but the reduction in the size of his majority will significantly change the way in which he is able to act.His power and his position in the party have depended almost entirely on the perception since his landslide victory in 1997 that he is a winner. In many parts of the country that has now been undermined. Last night's result could make it more difficult for the Prime Minister to stay in office for the whole of the next Parliament as he promised to do...