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NBC poll: Mitt Romney, Ron Paul neck-and-neck in Iowa; Newt Gingrich in 5th

Former Massachusetts Gov. Mitt Romney and Texas Rep. Ron Paul are running neck-and-neck in Iowa, former Pennsylvania Sen.

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.

Click here for full results of the poll from NBC's Mark Murray.  

Ed will have full analysis of the Iowa caucus tonight at 8pET on msnbc!