According to a CNN/ORC poll, overall, 48 per cent of likely caucus attendees in Nevada support Clinton, while Sanders is supported by 47 per cent.
Both candidates carry their demographic strong points from prior states into Nevada, with Clinton holding an edge among women, while Sanders tops the former secretary of state among voters under age 55, the poll said.
However, Clinton holds a commanding lead over Sanders in South Carolina. As per the average of all major polls compiled by RealClearPolitics.Com, Clinton has an advantage of nearly 14 per cent against Sanders.
In the polls among Republican caucus-goers, real estate mogul Trump has support of 45 per cent, and leads by a massive 26 percentage points over his nearest rival senator Marco Rubio from Florida, who has support of 19 per cent, followed by Senator Ted Cruz (17 per cent) and retired neurosurgeon Ben Carson (7 per cent).