besides the obvious election fraud end of having only R's in position to prevent investigations Bush and Rove wanted to have the already ongoing investigations axed,
"It's all part of a growing ongoing investigation into corruption in defense and intelligence contracts, which already has sent former Rep. Randy “Duke” Cunningham to prison and, legal sources say, may threaten others in Congress and the CIA. "
http://www.msnbc.msn.com/id/12634250/This appears to me at least to be why Ms Goodling and her handlers have chosen John Dowd, a noted attorney who has written about money-laundering, to be her attorney-- in order to run cover for the ongoing money-laundering/covert-operations that these investigations will ultimately run into.
Already 'national security' has been thrown in as a defense mentioned in the Renzi case (land next to Ft Huachuca AZ). You can bet that 'national security' will be something Congress will run into as a roadblock, put up by these 'others' mentioned in the April 2006 MSNBC article above.
In a strange way, what Mr Turley says about delay in having Ms Goodling testify, ultimately hurts her case but lets the ongoing "background crimes" continue. Strange indeed.
Congressmen/women need to read Renata Adler's In Search of The Nixon Scandal in her book Canaries in the Mineshaft and also as a separate piece in the Dec. '76 Atlantic Monthly. Watergate was all about hiding the CIA/GOP money trail at that time. Chilean investors and a Mexican bank and Nixon's CREEP; it all was CIA $ coming back into the US to fund Nixon. That's what the House banking committee never fully investigated. Follow the money sadly never occurred.