The race between Hillary Clinton and Bernie Sanders for the U.S. Democratic presidential nomination – once a civil affair – has taken a sour turn, with mud-slinging from both camps over the former secretary of state's win in the Nevada caucuses. Sanders' supporters are alleging that foul play by casino managers helped Clinton out in Saturday’s contest, while Clinton's camp has blasted – in at times vulgar terms – the Vermont senator's assertion he took the state's Latino vote. Sanders, who had surged in recent months to challenge front-runner Clinton, is trying to maintain momentum against her in a part of the United States where she wields an advantage among minority voters.