Romney and Cain do significantly better (about five points each) with very likely caucus goers, while Perry's numbers with somewhat likely caucus goers are 10% and only 3% with very likely caucus goers.
But it looks like the Cain Train is chugging along, despite the racist attacks of some.
Were the presidential election a cartoon, this poll would be representative of the moment where Wile E. Coyote runs straight off the cliff but, for a couple seconds, runs straight across mid air before realizing that he just fell off a cliff and plummeting to earth.