The Executive Editor of The Guardian Newspaper is an American named Albert Scardino, a Pulitzer prize-winning journalist. The letter writing campaign was his idea.
After some searching I found that he gave out 11,000 addresses of registered voters. I can't find any examples of of letters actually being sent to Clark County. I can't find any examples of people from Clark County recieving letters either, only letters from people in other parts of America writing to complain about or support the letter writing campaign.
My conclusion is that it was a very successful (over 1million hits per day) publicity stunt.
http://www.google.com/search?hl=en&q...=Google+Search