Two nation polls. Quinnipiac and Emerson. Quinnipiac goes from 12/16 to 12/20 and has Trump 28 Cruz 24. Emerson goes from 12/17 to 12/20 and has Trump 36 Cruz 21.
This makes little sense. Even on margin of error if Trump low end is 28 and Cruz high end is 24 I would think max should be Trump 31. Based on these two polls.