From http://my.barackobama.com/page/content/hqblog and also http://i.l.cnn.net/cnn/2008/images/01/23/nv001.pdf
January 22, 2008
Jill Derby, Chair
Nevada State Democratic Party
1210 S. Valley View Road
Las Vegas, NV 89102
Dear Chair Derby:
On behalf of the Obama for America campaign, I am writing to request that the Nevada State Democratic Party conduct an inquiry into an apparent and disturbing pattern of incidents reported at precinct locations throughout the state during the January 19 Caucus.
These reports suggest the possibility of activity conducted in violation of Party rules and the rights of voters—activity that, as the volume and distribution of those complaints indicate, may have been planned and coordinated with the willful intention to distort the process in the favor of one candidate, Senator Clinton. A sheet of instructions provided by the Clinton campaign to its precinct works captures its program for the Caucus: "It's not illegal unless they [the temporary precinct chairs] tell you so." (See attachment). This certainly suggests that, for the Clinton campaign, the operative standard of conduct was, simply and only, what it could get away with.
On the day of the Caucus, we received by phone reports of misconduct, violations of the rules and irregularities, in the hundreds. Since that time, well over a thousand more accounts have been sent to us. Others have begun to emerge in other sources. http://andrewsullivan.theatlantic.com/the_daily_dish/2008/01/sleaze-in-nevad.html#more