Good article here -
http://www.********.com/read.php?ID=28463
Taken from that article - "In a 2007 Senate committee meeting, then-Attorney General Alberto Gonzales said his office asked for the resignation of a Nevada U.S. attorney in part because of the attorney's lackluster desire to prosecute obscenity, according to a transcript of the meeting published in The Washington Post.
The choice to investigate and to prosecute obscenity cases lies with the presidential administration, said law professor Freedman. If President Bush wants federal prosecutors to focus on obscenity laws, that is his right as an elected leader."