It seems the mainstream media has a short attention span…
It also seems that policy wonks in D.C. are the most interested, having the highest search volume, the rest of the USA, not so much:
See it yourself: http://www.google.com/trends/explore#q=climate%20change%2C%20national%20climate%20assessment&geo=US&date=today%201-m&cmpt=q
h/t to Dr. Roger Pielke Jr. on Twitter