Tired Barack Obama resorts to aggression By Tim Shipman in Kokomo, Indiana Last Updated: 2:00am BST 27/04/2008 He seems tired, brittle and more aggressive, and some of his appealing hope and charisma have been dispensed with. Five days after losing to Hillary Clinton in the Pennsylvania primary, Barack Obama has taken off the gloves in his battle to win the American presidency - and in so doing has left critics wondering whether he is not just another conventional politician grubbing for votes. After his loss in Pennsylvania, Obama strengthens his attack In Indiana on Friday, scene of his next showdown...