It is very clear. His thesis is that:
1) Most likely voters think illegal immigration is a serious problem.
2) Most, if not all, Democrat candidates want the borders flung wide open.
3) The Dem candidates simply will not, cannot touch the illegal issue in the campaign.
4) Therefore, Trump will win.
See, nice and easy to understand.
First, you are being condescending. I know damn wewll what he is trying to say, and I am not criticizing what he is trying to say. I am tearing him to shreds for his compositional skills.
If I cannot understand clearly what his statistics mean on three re-readings, without projecting my own desired interpretation into it, what I would like the statistics do say, then it is poor composition. Figures lie and liars figure, so I am going to attack anyone, especially on our side, who attempts to rely on statistics whose interpretation and meaning are highly questionable.