Are you aware that this is from a CNN internal memo? CNN has known about this for months and has been sitting on it just like the John Edwards story. Look at the addy of the actual pdf file.
http://i.a.cnn.net/cnn/2008/images/01/23/nv.state.letter.1.23.08.pdf
This cat fight between the Clinton and Obama campaigns has been the media since it started back in Mid Jan., 2008. Here is a link to a Boston Hearld article of Obama’s complaint against the Clinton camp.
http://www.bostonherald.com/blogs/news/the_beat/?p=215
Washington Post:
http://blog.washingtonpost.com/thefix/2008/01/clinton_won_or_did_she.html
Time.com
http://www.time-blog.com/swampland/2008/01/obama_files_a_nevada_complaint.html
Turns out there's another explanation for the numbers, huh?