race hillary clinton bernie sanders u.s. democratic presidential nomination civil affair take sour turn mud-slinging camp former secretary state win nevada caucus sanders supporters allege foul play casino managers help clinton saturday contest clinton camp blast time vulgar term vermont senator assertion take state latino vote tensions reflect tight battle two head next saturday south carolina primary sanders surge recent months challenge front-runner clinton try maintain momentum part unite state wield advantage among minority voters angry tone also mark turn mostly civil race democratic side contrast noisy insult-hurling characterize much republican race. sanders former first lady publicly clash approach healthcare regulate wall street frequently emphasize common grind social issue sanders also refuse far join republican attack clinton record secretary state let talk real issue face america say one televise debate tone sour nevada officials national nurse unite endorse sanders say irregularities casino caucus sit casino managers wear clinton paraphernalia say amount intimidation casino employee voters nurse observe nevada sanders campaign call un observers protect democracy union say one twitter post sunday neither clinton sanders campaign immediately respond request comment allegations meanwhile campaign argue poll nevada caucus show one set entrance exit poll result conduct cbs news show sanders take 53 percent latino vote state critical group sanders seek broaden support base early result narrow loss decisive win iowa new hampshire overwhelmingly white voter populations typically like swear twitter account far complete utter bullshit clinton spokesman nick merrill write twitter refer sanders campaign press release assert take latino bloc nevada clinton expect find easy territory contest move south state-by-state battle pick party presidential nominee november general election backers say minority voters firewall sanders popularity among young voters dislike establishment politics attract vow take wall street excesses high college fee nevada nearly quarter latino point sanders camp meanwhile dispute clinton camp assertions draw lion share union vote nevada contest accuse campaign invent figure tendency make stuff sanders spokesman michael briggs say email american federation teachers issue press release monday list 23 unions back clinton write richard valdmanis edit frances kerry article fund part sap independently create reuters editorial staff sap editorial involvement creation production clinton sanders race take angry tone nevada