A poll out from CBS on Sunday shows businessman Donald Trump and former neurosurgeon Ben Carson tied for first place for the Republican nomination among likely caucus voters in Iowa.

Both candidates dominated the competition with 27 percent apiece in the Hawkeye State, according to the CBS News 2016 Battleground Tracker, conducted by the online polling organization Yougov. Trump and Carson currently hold the No. 1 and 2 spots in the Washington Examiner's presidential power rankings.

The poll factored in the results of two surveys. One wave took place Sept. 3-10, the second in Oct. 15-22. Trump held a slight lead in September, but lost ground to Carson in October. Carson also leads among women, while Trump has the backing of the majority of men and seniors.

Three sets of Iowa poll results released last week, looking only at results from October, all showed one thing: Carson snagging the lead from Trump, who had maintained a lead for months.

  • Jim McLaughlin & Associates poll (conducted Oct. 20-22): Carson at 28 percent, Trump at 20 percent.
  • Des Moines Register/Bloomberg poll (conducted Oct. 16-19): Carson at 28 percent, Trump at 19 percent
  • Quinnipiac poll (conducted Oct. 14-20): Carson at 28 percent, Trump at 20 percent.

Rounding out the top five in CBS Iowa poll were Sen. Ted Cruz at 12 percent, Sen. Marco Rubio at 9 percent and former Gov. Jeb Bush at 6 percent.

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