new york vermont senator bernie sanders erase secretary state hillary clinton wide lead democratic presidential nomination since start year put two dead heat nationally accord reuters/ipsos poll clinton lead sanders 48 percent 45 percent among democratic voters accord poll 512 americans conduct feb. 2-5 follow iowa caucus poll credibility interval percentage point democrats support clinton 2-to-1 margin begin year sanders narrow lead considerably past several weeks clinton beat sanders narrowly iowa caucus nation first nomination contest ahead november election expect lose new hampshire two rival clash thursday night first one-on-one debate reflect tightness race still wide gap two name recognition nationally nearly quarter democrats two-fifths independents say still familiar sanders comparison clinton almost total name recognition among voters republican side donald trump continue lead field 40 percent support level support among republicans relatively unchanged follow second-place finish iowa caucus senator ted cruz texas follow 16 percent senator marco rubio florida come third 13 percent democrat poll result bit.ly/1ppdeh2 republican poll result bit.ly/1urswih 2016 presidential race see reuters blog tales trail edit richard valdmanis lisa shumaker sap sponsor content independently create reuters editorial staff fund part sap otherwise role coverage exclusive presidential hopefuls sanders clinton dead heat reuters/ipsos poll