In and of itself it’s more a technical error than a smoking gun, but in context this seems part of a pattern of carelessness:
Sources indicate that Ms. Miers failed to mention her tenure as a member of the Martindale-Hubbell/Lexis-Nexis Legal Advisory Board.
I understand how a busy person might honestly forget even something fairly substantial such as a Board membership. I remember how much trouble I had documenting my life when I had to apply for a security clearance, and I was only 28 at the time. But that is why any well-organized person keeps their c.v. up to date — it’s a way to make sure you have a record of everything you’ve done should you ever need one. I try to update mine at least once a year. (Hmm… looks like it’s time to update it again….)
Given that one of the major talking points for Miers has been how ‘meticulous’ she is, the drip drip drip of sloppy mistakes that might well be ignored for a different nominee will in this case continue to erode her rapidly shrinking prospects.