Trump grabs double-digit lead in Iowa poll

Donald TrumpDonald John TrumpTillerson: Russia already looking to interfere in 2018 midterms Dems pick up deep-red legislative seat in Missouri Speier on Trump's desire for military parade: 'We have a Napoleon in the making' MORE has captured a double-digit lead in the first voting state of Iowa a little over a week before the caucuses there, according to a CNN/ORC poll released Thursday.

Trump is supported by 37 percent of likely GOP voters in the Hawkeye State, followed by Ted CruzRafael (Ted) Edward CruzSasse statement: Trump nominee who spread conspiracy theories has a ‘tinfoil hat’ Coalition of 44 groups calls for passage of drug pricing bill For the sake of our democracy, politicians must stop bickering MORE, at 26 percent, and Marco RubioMarco Antonio RubioTrump must send Russia powerful message through tougher actions McCain, Coons immigration bill sparks Trump backlash Taking a strong stance to protect election integrity MORE at 14 percent. 

That represents at least a 3-point rise for each of those candidates from the same survey conducted in late November and early December. 

All other candidates remain in single digits in the latest survey, with Ben CarsonBenjamin (Ben) Solomon CarsonEPA to jumpstart 'war on lead' with strategy meeting Emails show Carson family involvement in HUD affairs: report Officials raised ethics concerns over Ben Carson's son assisting HUD event: report MORE at 6 percent, Jeb Bush at 3 percent, Mike Huckabee at 3 percent and Rand PaulRandal (Rand) Howard PaulPentagon: War in Afghanistan will cost billion in 2018 Overnight Finance: Senators near two-year budget deal | Trump would 'love to see a shutdown' over immigration | Dow closes nearly 600 points higher after volatile day | Trade deficit at highest level since 2008 | Pawlenty leaving Wall Street group Rand Paul calls for punishment if Congress can't reach a long-term budget deal MORE at 2 percent.

Trump has been battling Cruz for the past two weeks for support in Iowa.

This week Trump unveiled an endorsement from former 2008 Republican vice presidential candidate Sarah Palin, who campaigned with him in Des Moines. Iowa Gov. Terry Branstad also called for the Texas senator to be defeated. 

While Cruz was considered a month ago to be a favorite to win the Feb. 1 caucuses in Iowa, several recent polls have indicated a much tighter race between him and Trump there. 

The pair have battled for the support of evangelical voters.

The CNN/ORC poll of 266 likely GOP caucus-goers was conducted Jan. 15–20 via telephones with a margin of error of 6 percentage points.

Three recent polls in the state have shown more malleability in the race between the two front-runners, with one finding Cruz with a 2-point edge and two others putting Trump up by either 1 point or 6 points.

Nearly half of respondents in the latest CNN/ORC poll, 49 percent, said they have "definitely decided" on a candidate, while 22 percent are leaning toward one and 28 percent are undecided.