As I stated on Matthew Greenberg's post, my suspicion is that this is a purposeful effort to put the issue of "In Dog We Trust" before the US Supreme Court. In addition, there's also the matter of the current case seeking to remove "under god" from the Pledge of Allegiance, on the grounds that it discriminates against atheists.
At some level, I wonder if the ultimate goal of the theists and their god-declarations is to have it legally found that the US IS a christian nation and nullify the Establishment Clause of the First Amendment to the Constitution.
It wouldn't surprise me.
Perhaps the god-declarers are hoping the Supreme Court will rule that "In God We Trust" is harmless "ceremonial deism" (we've heard that before), which would fly in the face of the Establishment Clause.
For whatever it's worth, I've called my state rep. opposing this. (He's a Democrat and would likely oppose it anyway. The committee vote was almost perfectly along party lines... further evidence that America's two major parties are in fact quite distinct.)
There's plenty of discussion on this in Matthew Greenberg's post "No F'ing Way". Worth reading.