President Bush acknowledged persistent racism in America and lamented the Republican Party's bumpy relations with black voters as he addressed the NAACP's annual convention Thursday for the first time in his presidency. "I understand that racism still lingers in America," Bush told the National Association for the Advancement of Colored People. "It's a lot easier to change a law than to change a human heart. And I understand that many African-Americans distrust my political party." That line generated boisterous applause and cheers from the thousands in the audience, which generally gave the president a polite, reserved reception. "I consider it...