This lukewarm reception could have been part of a Democrat feint, though. Acorn and Son Of Acorn never urged anybody to go to an Obama rally. Why put their puppets to any more trouble than needed to take the election itself?
Also, think of all the money saved on yard signs/buttons/T-shirts/bumper stickers produced and distributed. There was little to no visible sign of BO support via signage and merchandise -- either this was also part of the feint, and/or they knew the election results were a foregone conclusion via fraud, so why bother expending the money.