“600 likely Republican primary voters” means +/- 4.5 points accuracy.
“Gingrich leads among men with 38%, followed by Romney with 26%, Santorum with 20%, and Paul with 14%. Romney leads Santorum 43% to 25% among women, followed by Gingrich with 24% and Paul with 2%.”
This sentence says it all. The country is up for its punishment.