Trump retains slight lead in Iowa Quinnipiac Poll, Likely Republican Caucus-goers, Jan. 5-10, 2016. Trump well ahead of field on handling economy, illegal immigration, and terrorism

Trump 31
Cruz 29
Rubio 15
Carson 7
Christie 4
Bush 3
Huckabee 3
Kasich 2
Paul 2
Fiorina 1 

602 Likely Iowa Republican Caucus goers, Jan. 5-10, 2016, 4% error margin, live interviews via land lines and cell phones

1/11/2016, "Trump, Cruz, running away with Iowa GOP Caucus, Quinnipiac University Poll Finds; Cruz way ahead on favorability, character traits," Quinnipiac

"From January 5 - 10, Quinnipiac University surveyed 602 Iowa likely Republican Caucus participants with a margin of error of +/- 4 percentage points. Live interviewers call land lines and cell phones."... 

More Iowa voters choosing Trump say their mind is made up, won't change:

Q. 1A, Likely Iowa Republican Caucus goers

Mind made up about candidate of choice

Total 52
Trump 61
Cruz 55

Trump is well ahead on handling the economy, illegal immigration, and terrorism:
 
Q. 16, Economy: Trump 46, Cruz 16

Q. 18, Illegal Immigration: Trump 46, Cruz 22

Q. 21, Terrorism: Trump 36, Cruz 26
.........  
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"This compares to the results of a December 14 survey by the independent Quinnipiac (KWIN-uh-pe-ack) University showing Trump at 28 percent, with 27 percent for Cruz, 14 percent for Rubio and 10 percent for Carson....

The Quinnipiac University Poll, directed

by Douglas Schwartz, Ph.D., conducts public
opinion surveys in Pennsylvania, New York,

New Jersey, Connecticut, Florida, Ohio, 

Virginia, Iowa, Colorado and the nation as

a public service and for research."