Barack Obama, the Democrat aiming to become America's first black president, has condemned Republican slurs about his background after a leading candidate confused him with Osama bin Laden. In what aides claimed was a slip of the tongue, the former Massachusetts governor Mitt Romney accused the Illinois senator of urging terrorists to converge in Iraq — as the al-Qa'eda leader did in a tape released this week. In the midst of criticising Democrats' foreign policy, he said: "Actually, just look at what Osam — uh — Barack Obama, said just yesterday. Barack Obama calling on radicals, jihadists of all different...