Some detail from the Emerson poll.
Trump Name Recognition:
Frequency Percent
Favorable 182 43.5
Unfavorable 207 49.5
Undecided 27 6.5
Never heard of 2 .5
Total 418 100.0
Basically, this would tend to indicate that Trump's supporters (36% of the sample) are highly loyal. Conversely, a high percentage of those who don't intend to vote for him pretty much hate his guts.
Assuming all of those who intend to vote for Trump have a favorable opinion of him, they would seem to account for at least 82.75% of his "favorables" in the sample. Assuming that to be (self-evidently) true, then the remaining 64% of respondents who do not intend to vote for Trump would have a cumulative favorable/unfavorable or undecided split of 7.5%/92.5% toward Trump.