As a Cruzer who knows when it is time to pack it in and unify under Trump, I would say that the difference between Trump’s and HRC’s negatives is that Hillary has been on the political scene for so long that it is well nigh impossible for her to convince those who are disaffected by her to change, while it is possible for Trump, who can still become “more Presidential” without completely dropping the brashness and bluntness that got him here, to lower some of his negatives between now and November.
Nevertheless, there will ALWAYS be a plurality who are negative towards Trump, in small part because he is Trump, and in large part because he is Not Down With The Struggle Where Resist We Much. If you think the animus towards Reagan was difficult, it will seem like a Sunday School picnic compared to the out-and-out rebellion that will be planned and funded for a Trump Presidency—and it would have been the same for Cruz, and probably even for Jeb! as well. The left will not go quietly into the good night.
See, I disagree in the sense that Trump’s “negatives” are badly worded. They are NOT political “negatives” but entertainment “negatives” the way one views a Hollywood villain, Richard Petty, “The Undertaker” in WWF, or J. R. Ewing. These are people you boo, then line up to get a jacket or photo or autograph.
In short, I don’t think these are apples to apples negatives. It’s simply impossible for Trump to do as well as he does in the primaries and have these numbers be even close to real.