Poll Confusion

Strange poll results in South Carolina.

Real Clear Politics has posted poll results on September 30th and October 1st from two different organizations: Rasmussen and American Research Group. The polls cover roughly the same period yet they come up with drastically different results.

ARG:
Thompson: 10
Giuliani: 23
Romney: 26

Rasmussen
Thompson: 24
Giuliani: 20
Romney: 15


Rasmussen's numbers are more in line with the other polls that have been taken. I think there is something dramatically wrong with the American Research Group poll. Their other polls seem to be ok, but this one seems really off.