WASHINGTON (Reuters) - A trip to Europe to commemorate D-Day this week will give President Bush (news - web sites) a chance to shore up his battered standing in the world, but he also faces political risk if he fails to enlist more help in stabilizing Iraq (news - web sites). Bush sets off on Thursday for Italy and France where he will dine with foreign leaders, confer with Pope John Paul (news - web sites) II -- one of his harshest critic of the war in Iraq -- and deliver a speech on the coast of Normandy where Allied...