(CNN) - Newt Gingrich leads the pack of GOP presidential candidates in a fourth straight poll of likely Iowa Republican caucus goers.
Thirty-one percent of people questioned in a CBS News/New York Times survey say that the former House speaker is their choice for their party's nominee, with 17 percent supporting former Massachusetts Gov. Mitt Romney and 16% backing Rep. Ron Paul of Texas. The poll's Tuesday afternoon release comes four weeks before the Jan. 3 Iowa caucuses, which kick off the Republican presidential primary and caucus calendar.
The survey indicates that 11% support Texas Gov. Rick Perry, with 9% backing Rep. Michele Bachmann of neighboring Minnesota and 4% supporting former Sen. Rick Santorum of Pennsylvania. Both Bachmann and Santorum have been crisscrossing Iowa the past couple of months.
The poll's results mirror an ABC News/Washington Post survey released Tuesday morning. According to that poll, 33% of likely Iowa GOP caucus goers say they back Gingrich, with Romney, who's making his second bid for the GOP nomination, and Paul, who's making his third run for the White House, each at 18%, Perry at 11%, Bachmann at 10%, and Santorum at 7%.
The survey indicates that Jon Huntsman's at 2%. The former Utah governor and ambassador to China has spent nearly all of his time campaigning in New Hampshire, which votes second after Iowa. Four percent are unsure who to support and six in ten say they could change their minds over the next four weeks.
Asked about the latest polls, Romney told reporters Tuesday in Arizona that "my expectation is that this is going to be a campaign that's going to go on for a while and I expect to win it."
Gingrich's campaign was left for dead by many in late spring, after a bunch of controversies which resulted in a number of top advisers and staffers quitting the campaign. They also faced financial difficulties. But thanks to strong performances in many of the Republican presidential debates this autumn, and thanks to stumbles by Bachmann, Perry and businessman Herman Cain, who suspended his campaign this past weekend, Gingrich has soared in both national polling and in surveys in the crucial early voting states.
The challenge for Gingrich now is to use his skyrocketing poll numbers and increase in fundraising to quickly build a larger and more effective campaign structure in the early voting states. Gingrich went up with his first campaign TV commercial Monday, in Iowa.
According to the ABC/Washington Post poll, Gingrich leads Romney by 27 points when it comes to experience, by 14 points on standing up for what he believes, by 13 points when it comes to reflecting the values of the GOP and by 10 points on understanding the problems of people like me. Gingrich holds a narrower five-point margin over Romney on electability and is basically tied with Romney on honesty.
The survey indicates that, at least in Iowa, the issue of illegal immigration may not hurt Gingrich, who has come under attack by some of his rivals for his calls for a pathway to legitimacy for some longtime illegal immigrants. By 19 points, Hawkeye State Republicans say Gingrich would do a better job on the issue over Romney, who has been critical of Gingrich over immigration. Only 15% say Gingrich's position on the issue is a reason to oppose him for the nomination, with nearly four in ten saying it's a reason to support him.
Separately, only 16% say Gingrich's marital history is a reason to not support him. Gingrich has been married three times and has admitted to extramarital affairs.
Meanwhile, the poll indicates the health care measure signed into law over five years ago by then-Massachusetts Gov. Romney, which includes an individual mandate and is considered by some Republicans as the model for President Barack Obama's national health care law, could be damaging. Forty-five percent of those questioned say the so-called "RomneyCare" law is a major reason to oppose Romney for the nomination.
The ABC News-Washington Post poll was conducted Nov. 30-Dec. 4, with 858 potential Iowa Republican caucus goers, including 356 likely GOP caucus goers, questioned by telephone. The survey's overall sampling error is plus or minus four percentage points, with a sampling error of plus or minus six percentage points for likely caucus goers.
The CBS News-New York Times poll was conducted Nov. 30-Dec. 5, with 642 Iowa registered voters who say they are definitely or probably attending the GOP caucuses questioned by telephone. The survey's overall sampling error is plus or minus four percentage points.