I think Luntz is an idiot because he has no blacks, hispanics, asian or native americans in his group.
Now, I see a trend looking at some of the other pollsters.
Since Luntz's group was composed of undecided voters, it would have been much more difficult to find undecided blacks and Hispanics, maybe less so Asians. And they were also restricted to Nevada voters.
And there were one or two who were Hispanic or lighter skinned blacks.