Two days ago, we wrote about a GAO report on presidential signing statements. While signing statements can be used legitimately to indicate how the executive branch interprets a law passed by Congress, the Bush Administration has used them to basically nullify laws without having to go through the embarrassment of vetoing them. Moreover, this president has used signing statements in unprecedented numbers. (For a couple examples of laws that were distorted or completely ignored because of this problem, see this article from our March/April 2007 issue.)
Democrats in Congress caught wind of the GAO report -- which is no shock because two Democrats in Congress commissioned it -- and will investigate. No law has been broken, just the spirit of the law violated, so it's unlikely that Congress's inquiry will lead to anything more than a reprimand. But add this to the list of very needed investigations that began only after the GOP lost control of both houses.