NBC reports on its latest Iowa poll:

Former Massachusetts Gov. Mitt Romney and Texas Rep. Ron Paul are running neck-and-neck in Iowa, former Pennsylvania Sen. Rick Santorum is surging and former House Speaker Newt Gingrich collapsing just four days before the state's Jan. 3 caucuses, according to a new NBC News-Marist poll.

Romney drew the support of 23 percent of likely caucus-goers in Iowa – identified based on interest, chance of voting and past participation – ahead of Paul, at 21 percent.

They are followed by Santorum at 15 percent, Texas Gov. Rick Perry at 14 percent, Gingrich at 13 percent and Minnesota Rep. Michele Bachmann at 6 percent.

Next Page