Trump catches Carson in Iowa poll
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Donald TrumpDonald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE is back in the lead in Iowa, according to a new CNN/ORC International poll. 

 
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Those findings show a much closer race between the two candidates than did several recent surveys that put Carson several points ahead.
 
Still, half of Iowa GOP voters in the CNN poll released Friday are undecided on a candidate to support in the February caucuses. Twenty-seven percent have "definitely decided."
 
The latest CNN survey in Iowa finds Sen. Marco Rubio (R-Fla.) in third place, with 13 percent, and Sen. Ted Cruz (R-Texas) following closely behind at 11 percent. 
 
Former Florida Gov. Jeb Bush follows at 5 percent, with former Hewlett-Packard CEO Carly Fiorina and Louisiana Gov. Bobby Jindal taking 4 percent each. 
 
On the Democratic side, former Secretary of State Hillary Clinton continues to lead Bernie Sanders, taking 55 percent to the Independent Vermont senator's 37 percent in the latest CNN poll on Iowa. 
 
The survey of 548 likely GOP caucusgoers was conducted Oct. 29 through Nov. 4 via landlines and cellphones with a margin of error of 4 points. The survey of 498 Democrats has a margin of error of 4.5 points.