42-41 Christie/Clinton
48-41 Clinton/Paul
48-39 Clinton/Bush
50-37 Clinton/Cruz
From December 3 - 9, Quinnipiac University surveyed 2,692 registered voters nationwide with a margin of error of +/- 1.9 percentage points. Live interviewers call land lines and cell phones. The survey includes 1,182 Republicans with a margin of error of +/- 2.9 percentage points and 1,095 Democrats with a margin of error of +/- 3 percentage points.
http://www.quinnipiac.edu/institutes-and-centers/polling-institute/national/release-detail?ReleaseID=1988