Iowa likely Republican Caucus participants give Carson the best favorability rating, 79 - 15 percent, with 73 - 15 percent for Cruz, 70 - 18 percent for Rubio and 59 - 34 percent for Trump. Bush has a negative 39 - 53 percent favorability rating.
The economy and jobs are the most important issues in deciding who they will support, 24 percent of GOP caucus-goers say, with 15 percent each for terrorism and foreign policy, 11 percent for the federal deficit and 10 percent for immigration.
Trump can best handle the economy, 49 percent of Republicans say, with 11 percent picking Cruz. Carson, Rubio and Fiorina are the choice of 6 percent each.
Trump is tops handling terrorism, 30 percent of Republican Caucus-goers say, with 20 percent for Cruz, 10 percent for Rubio and 7 percent for Bush. Carson, Paul and New Jersey Gov. Christopher Christie are at 5 percent each.
Cruz is best on foreign policy, 24 percent of Republicans say, with 18 percent for Trump, 15 percent for Rubio and 8 percent for Bush. Carson and Paul are at 6 percent each.
Iowa likely Republican Caucus participants oppose 81 - 15 percent allowing Syrian refugees into the U.S. and oppose 82 - 13 percent allowing them into Iowa.
Republicans support 73 - 22 percent sending U.S. ground troops to fight ISIS in Iraq and Syria and say 83 - 9 percent that the U.S. and its allies are losing the fight against ISIS.
A total of 88 percent of Republicans are "very worried" or "somewhat worried" about the possibility of a terrorist attack in the U.S. similar to the attack in Paris.
"One thing almost all Iowa Republicans agree upon is that Syrian refugees should not be allowed into the United States or into Iowa," Brown said.
