Top photograph of Obama in Greenville, Mississippi yesterday by Alex Brandon/AP; lower photograph of Clinton at Temple University in Philadelphia by Carolyn Kaster/AP Barack Obama is projected to win the Mississippi primary, with about 59% of the vote to Hillary Clinton's 39%. He will earn at least 6 of the state's 40 delegates, with the final split still to be determined. In what the AP called another "racially polarized presidential" contest, Obama won 91%......