Rumanian coal miners.
Oh, and the campaign has decided it's going to shout down anybody who offers a criticism in a public forum.
The aggressive rebuttals are very much informed by Obama's determination to avoid being victimized by the sort of attacks leveled against Sen. John Kerry, the 2004 Democratic presidential nominee stung by TV ads run by a group called Swift Boat Veterans for Truth.
Except, of course, that regurgitating scripted bullet-points that boil down to "he's a liar!" isn't a "rebuttal," no more than a group of zombies saying "braaaaaaainnnnnnns" constitutes a dialogue.