Given that Gonzales is currently testifying under oath (or not, depending on the question), I suspect someone was trying to cross-check his statements against what Ralston said. Also, Murray Waas has just dropped another Rove bombshell, which could have had something to do with it too:
The Bush administration has withheld a series of e-mails from Congress showing that senior White House and Justice Department officials worked together to conceal the role of Karl Rove in installing Timothy Griffin, a protégé of Rove's, as U.S. attorney for the Eastern District of Arkansas.Here's the House hit:
I should keep a collection of these hits. The last big one was the Executive Office of the President. Always glad to help guys. Don't forget to pass the URL on to the Press!