There now appears to be a trail through Gonzales, through Rove and directly to Dubya...

Josh Marshal at Talking Points Memo has a bunch of things to consider.
First there is the McClatchy report linking Bush directly to these politically inept maneuvers.

...Sunday, the Albuquerque Journal reported that Sen. Pete Domenici, R-N.M., told Gonzales in the spring of 2006 that he wanted New Mexico U.S. attorney David Iglesias dismissed, and that Gonzales refused. The newspaper said that Domenici later made the same case to White House adviser Karl Rove and spoke to President Bush about it after the November election, but before the attorney firings were announced on Dec. 7. Iglesias was among those fired.

David Kurtz at TPM goes back over quotes from Bush and his mouthpieces

A TPM reader asks this question.

...Implicit in all the coverage is the assumption—by Democrats and Republicans alike—that the Attorney General is going up to Capitol Hill to lie. As far as I can tell, this is a universal assumption. The Republicans are rooting for Mr. Gonzales to be successful in his perjury, to tell a coherent story that his enemies cannot break down. The Democrats are rooting the other way, off course. They’re hoping that their ace interrogators will be able to shoot enough holes in Mr. Gonzales’ story that they can destroy his credibility. But nobody seems to find it shocking or tragic that the Attorney General of the United States is going to lie to congress. . . .

(Emphasis mine)

Also read this post and this one too.