It's a simple answer, Senator Idiot. She refused to comply with a subpoena that every other American would be required to comply with.
SPECTRE is such a moron. If the Wilson-Plame-Miller case shows anything it's that journalists have all sorts of conflicting, dubious, and sometimes nefarious motives, and should no more be above the law than any of the rest of us. In fact, every reporter involved in the Plame affair should be required to testify in public, under oath, on all sources and details. The "public's right to know" should include knowing which charlatans in and out of government have been working in tandem with Joe Wilson, Larry Johnson, et al to feed this story and deceive the public.