Washington - As President Obama prepares for the highly anticipated speech he will deliver to the Muslim world from Cairo in early June, new polling from Arab countries suggests he has his work cut out for him. Only a small percentage of Arabs appear to have been won over by Barack Obama. There has been some slight improvement in US standing during the past year, based in part on the departure of President Bush and in part on Obama's policies, such as announcing a withdrawal from Iraq and a desire to shutter the Guantánamo detention facility. But one new poll...