new york prominent democratic donor worry party chance win presidency email dozens fan vice president joe biden friday urge remain prepare donate biden jump race donor bill bartmann cite new poll show senator bernie sanders vermont nearly tie hillary clinton erode 30-point lead former secretary state hold end last year bartmann party insiders concern sanders self-proclaimed democratic socialist far leave win republican nov. presidential election afford lose white house bartmann write email see reuters email draw string affirmative responses also see reuters biden announce october would seek presidency despite support group backers name draft biden 2016 whisper continue among donors hope biden could convince run clinton campaign prove fruitless sit sideline lot disappointment vice president decide get race patrick baskette one recipients bartmann email tell reuters baskette public affairs consultant tampa florida special assistant biden time senator baskette say oppose either clinton sanders think offer solutions nation future joe biden add clinton barely squeak win sanders iowa caucus week add fear could lose nomination think inevitable clinton widely expect lose new hampshire primary sanders tuesday count gary hindes chief executive delaware bay company llc former chairman delaware democratic party write email chain hop star line right joe become nominee hindes say reuters sanders far leave add say clinton could vulnerable well heart joe hindes say edit richard valdmanis leslie adler sap sponsor content independently create reuters editorial staff fund part sap otherwise role coverage democratic donor contact biden ally possible run