i actually doubt a democrat did this. at this point all attention is on the primaries. i have no doubt there are dirty tricks going on, but right now it's logically (on both sides) within the party.
I tend to agree. While it's possible that a democrat might want to start "sowing the seeds" for opposing Romney if he's the nominee, given that his nomination is by no means certain, doing this could be a big waste of money.
With that being said, there's
also a distinct possibility that a particular candidate didn't order this but that one of the myriad
independent political groups is behind it.
Either way, my money's on either Huckabee or one of the independent groups supporting him.