MINNEAPOLIS, Nov 7 (Reuters) - Voters elected a black Democrat as the first Muslim in Congress on Tuesday after a race in which he advocated quick U.S. withdrawal from Iraq and made little mention of his faith. Keith Ellison, a 43-year-old lawyer and state representative, defeated two rivals, television networks said, to succeed retiring Democrat Martin Sabo in a seat that has been held by Democrats since 1963. Ellison, who converted to Islam as a 19-year-old college student in his native Detroit, won with the help of Muslims among a coalition of liberal, anti-war voters. He advocates an immediate U.S....