Trump leads Republican field with 31 in Quinnipiac New Jersey poll, Nov. 4-8, 2015. Fifty-seven percent who choose Trump say their mind is made up, won't change.

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Trump 31
Carson 16
Rubio 15
Christie 8
Cruz 7 
Bush 4
Fiorina 4
Kasich 3

Quinnipiac NJ poll dates, 11/4-11/8, 2015. 481 NJ registered Republican voters, error margin 4.5

q. 1, Regarding candidate chosen, "Is your mind made up, or do you think you might change your mind before the primary?"

Trump-57% say mind is made up

Rubio-25% say mind is made up
Carson-14% say mind is made up

11/10/15, "Donald Trump leads the GOP presidential pack in New Jersey with 31 percent, followed  by Dr. Ben Carson with 16 percent, Sen. Marco Rubio of Florida with 15 percent, Gov. Christie with 8 percent and Sen. Ted Cruz of Texas with 7 percent, the independent Quinnipiac (KWIN-uh-pe-ack) University Poll finds....
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"(Methodology) This RDD telephone survey was conducted from November 4 – 8, 2015 throughout the state of New Jersey. Responses are reported for 1,456 self-identified registered voters with a margin of sampling error of +/- 2.6 percentage points. The survey includes 481 registered Republicans with a margin of sampling error of +/- 4.5 percentage points and 538 registered Democrats with a margin of sampling error of +/- 4.2 percentage points."