The Cook Political Report rates each state's leaning in the Electoral College based upon a canvas of at least four top strategists for each party. As of October 21, Nevada was rated a Toss Up.
Cook's U.S. electoral map

BUSH/CHENEY
3 Bush visits since March 3

Oct. 14 - BUSH: Rallies, Las Vegas, Reno
Sept. 16 - CHENEY: Rally, Reno
Sept. 14 - BUSH: Speech to National Guard Association, Las Vegas

KERRY/EDWARDS
6 Kerry visits since March 3

Oct. 26 - KERRY: Rally, Las Vegas
Oct. 22 - KERRY: Rally, Reno
Oct. 14 - KERRY: Speech to AARP, Las Vegas