Excerpt from an email I received from NumberUSA this morning:

OVERALL Presidential Candidate Ratings On IMMIGRATION
How Well Would Each Candidate PROTECT Workers, Communities and Taxpayers FROM OVER-IMMIGRATION?

(SEE BELOW FOR HOW POINTS WERE ASSIGNED ON 36-POINT SCALE.)

EXCELLENT
34 points:


DUNCAN HUNTER

GOOD
28 points:

FRED THOMPSON
22 points:

MITT ROMNEY

Fair
20 points:

RON PAUL
18 points:

MIKE HUCKABEE

Poor
8 points:

RUDY GIULIANI

Bad
7 points:

CHRIS DODD

JOHN McCAIN
5 points:

JOE BIDEN

JOHN EDWARDS

DENNIS KUCINICH

BILL RICHARDSON
4 points:

HILLARY CLINTON

BARACK OBAMA

HOW POINTS WERE ASSESSED:

Points are based on candidate promises as of 2JAN08 on
(a) amnesty,
(b) stoppping future illegal immigration and
(c) reducing importation of foreign labor competition, plus
(d) rating of past immigration actions in political office.

Look at full ratings in 16 categories at Presidential Candidate Ratings website.

Points were assigned to the ratings for the first four overall categories: 0 points for "abysmal" rating, 1 for "bad", 3 for "poor", 5 for "fair", 7 for "GOOD" and 9 for "EXCELLENT".
The above needs to be considered if your priority issue is immigration!

According to NumbersUSA, the information was updated and modified just today. Hunter has taken a clear lead on the issue!