See the full Des Moines Register poll of likely Democratic and Republican caucus-goers

Barack Obama has pulled ahead of the party’s national frontrunner Hillary Clinton in the Register’s much-watched Iowa Poll. Obama leads for the first time as the choice of 28 percent of likely caucus goers, up from 22 percent in October. Clinton was the preferred candidate of 25 percent, down from 29 percent in the previous poll. John Edwards held steady with 23 percent, in third place. Obama leads with support from 31 percent of women likely attend the caucuses, compared to 26 percent for Clinton.

On the Republican side, Mike Huckabee has leaped ahead of Republican presidential rival Mitt Romney in Iowa. Huckabee wins the support of 29 percent of Iowans who say they definitely or probably will attend the Republican Party’s caucuses on Jan. 3. That’s a gain of 17 percentage points since the last Iowa Poll was taken in early October, when Huckabee trailed both Romney and Fred Thompson. Rudy Giuliani, the frontrunner in national polls, holds third place in Iowa at 13 percent and Thompson has slipped to fourth place in the Iowa Poll, at 9 percent. John McCain and Ron Paul are tied for fifth place at 7 percent each.