The enthusiasm is a measure among the reported data. Not among the survey sample. The data was culled for likely voters, then the enthusiasm spread was among

The enthusiasm is a measure among the reported data. Not among the survey sample. The data was culled for likely voters, then the enthusiasm spread was among those that survived the cut. At the bottom of each page it says the results are all from the weighted sample. The concept here is that "likely" is a continuum, and the Republicans had an advantage at the extreme upper end of it. EDIT- Adding a note and then moving on from this. I understand you're saying the enthusiasm is baked into the final preference percentages, but that's not the case.