Zogby International conducted telephone interviews of a random sampling of approximately 600 likely primary voters statewide in each state over a rolling three-day period. All calls were made from Zogby International headquarters in Utica, N.Y., from Wednesday, January 28 through Friday, January 30. The margin of error is +/- 4.1 percentage points. In South Carolina, slight weights were added to age, race, and gender; In Missouri, slight weights were added to age, race, gender, education, region and party; In Oklahoma, slight weights were added to age, race, education and gender-- to more accurately reflect the voting population. Margins of error are higher in sub-groups.