BAGHDAD (Reuters) - A U.S.-appointed Iraqi judge has issued an arrest warrant for one of the fiercest opponents of former President Saddam Hussein in connection with murder, politicians and lawyers familiar with the case said Friday. Abdul Karim al-Mohammadawi is known as "Prince of the Marshes" for leading resistance to Saddam in Iraq's southern marshlands even after the ousted dictator drained the wetlands in a campaign to crush Shi'ite rebels in the 1980s and 1990s. The warrant states that Mohammadawi, a former member of Iraq's now defunct Governing Council, is wanted in connection with the murder of a police officer...