Ras Poll of Nevada: 47-47 tie.

Their previous poll had the president up 47-45, so the thing to keep in mind is that, according to RAS, Obama stayed exactly where he was and Romney gained a bit--but also it was within the margin of error then and it's still within the moe:

President Obama and Mitt Romney are now tied in Nevada.

The latest Rasmussen Reports statewide telephone survey of Likely Nevada Voters shows both candidates with 47% support. Three percent (3%) prefer some other candidate, and three percent (3%) more are undecided. (To see survey question wording, click here.)

http://www.rasmussenreports.com/public_content/politics/elections/election_2012/election_2012_presidential_election/nevada/election_2012_nevada_president