Bernie Sanders' high-flying Democratic presidential campaign fell back to Earth on Saturday in Nevada.<br />If the Vermont senator cannot quickly find a way to broaden his appeal to minorities and union members, last week's 22-point rout of Clinton in New Hampshire could prove to be his campaign highlight.<br />The race moves next week to South Carolina, where blacks make up more than half of the Democratic electorate, and on March 1 to a string of southern states with big blocs of African-Americans, who strongly support Clinton and have been slow to warm to Sanders.<br />The rush of March contests in big, diverse states -- Democrats in nearly two dozen states will vote between March 1 and March 15 -- could leave Sanders grasping for political life.<br />Although Clinton's 5-point win was relatively narrow, it was enough to blunt Sanders' momentum.
