Whistleblowing or Politics?

Over a year ago I wrote about a Department of Justice lawyer, Thomas Tamm, who seemed to have been involved in the FISA leak. Today, without the details I provided a year ago on Tamm's pro-Democrat anti-Bush ideological bent (maybe he doesn't know how to use google?) Michael Isikoff acknowledges that it was Tamm who leaked about the program to the New York Times.