Roy Moore hasno more political capitol left after his disasterous run for Alabama Governor in 2006, so he's out. Patrick Buchanan seems to be sick of making long shot bids for the White House. Jim Clymer and his Constitution Party suffer from such little name recognition I don't beleive they could make a seriosu bid.
I would assume a serious run could be mounted by Jerome Corsi, but he is the only figure on the far-right I can think of who could gain any votes at all. Perhaps he could run with Jim Gilchrist.
Right now, Corsi is the likely CP nominee.