This is the testimony of Grier Weeks, Executive Director, National Association to Protect Children before the US Senate Committee on the Judiciary on April 16, 2008:
The maps you are seeing today of domestic child pornography trafficking are not simply visuals depicting illegal Internet activity. Nor do they simply tell us where the criminals are. These are rescue maps. Law enforcement is now providing you with information that can lead authorities, very predictably, to tens of thousands of locations within the United States where children are in immediate danger and waiting for help.
That is because while all of these suspects are contributing to a massive black market that commissions the rape of children, a certain percentage are also directly sexually assaulting children themselves. Law enforcement has consistently estimated that somewhere between 30-40% of arrests for child pornography possession turn up evidence of local child victims.
http://www.senate.gov/general/contact_information/senators_cfm.cfm
And if you don't know what to write Oprah has a great form letter you can personalize here:
http://www.oprah.com/article/oprahshow/20080911_tows_predators
Hurry -they are voting on it this month!