So I've been slowly compiling a national map of voter registration by county, and I finished Nevada last week..... the Democratic Party there only has a lead in registration in three counties, Clark, Esmeralda, and Washoe; a very small lead in the latter two. The Republican Party can win there, they just need to turn out the vote from Lincoln County to Carson City.
The only county that matters in Nevada is Clark. 72.5% of the entire state population is in that county. All the Democrats need to do to win is to get over 53% in Clark county and keep Washoe close to even.
If every Obama voter outside of Clark and Washoe counties had stayed home and not voted, Obama still would have won the state by over 20,000 votes. There are just not enough available votes in the cow counties to make up much ground for Republicans.