(Agencies)
Updated: 2008-01-03 22:00

The rolling poll of 905 likely Democratic caucus-goers and 914 likely Republican caucus-goers was taken Sunday through Wednesday and has a margin of error of 3.3 percentage points for each party.

New Mexico Gov. Bill Richardson was fourth with 7 percent and Delaware Sen. Joseph Biden was at 5 percent. Connecticut Sen. Chris Dodd was at 1 percent and Ohio Rep. Dennis Kucinich was under 1 percent.

Iowa opens the process of choosing the next US president on Thursday night, kicking off a state-by-state battle to choose Republican and Democratic candidates for the November election to replace President George W. Bush.

Obama, Clinton and Edwards have battled for the lead in Iowa for months. Clinton, who would be the first woman president, holds a slight lead among women and is still strong among older voters. Obama leads among men and younger voters.

Edwards, a former North Carolina senator, remained the top second choice of Democrats. A candidate must have 15 percent support in each precinct to be viable or their supporters can switch to another candidate.

In the Republican race, Huckabee gained three points on Romney. The gains followed Monday's news conference where he said he would not air an ad attacking Romney because he wanted to keep the race positive -- and then showed it to reporters.

The move was heavily criticized in the media -- but his numbers have climbed since, Zogby said.

"Everyone outside of Iowa laughed at what appeared to be a Huckabee gambit, but Iowa Republicans seem to think it was genuine," he said.

"Huckabee is not pulling away, but it's now a six-point lead and he has moved above 30 percent."

Former New York Mayor Rudy Giuliani, who has largely bypassed Iowa to focus on later voting states, is at 6 percent. California Rep. Duncan Hunter is at 1 percent.

The rolling tracking poll concludes with these results. In a rolling poll, the most recent day's results are added while the oldest day's results are dropped in order to track changing momentum.

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