Iowa: Gingrich 28, Paul 13, Romney 12, Cain 10

Paul leads the field among independents by five points. Gingrich attracts 25 percent of the support from this group while Cain receives 22 percent.

Gingrich edges Paul among male voters by four points and holds an 18-point lead over Romney among female voters.

Most young voters are split between Paul and Bachmann, who take 47 percent each among those between 18 and 29 years of age. Gingrich wins the remaining age groups by solid double-digit margins.