Rounding error? More likely stupidity.
“Looking inside the numbers, Obama continues to lead Romney among key parts of his political base, including African Americans (94 percent to 0 percent), Latinos (by a 2-to-1 margin), voters under 35-years-old (52 percent to 41 percent) and women (51 percent to 41 percent).”
Wonder what happened to the missing 6 percent of African Americans?
To say nothing of the missing young and female voters.