Hillary Clinton has 1,359 endorsements from sitting Democratic state legislators, which represents 43% of the 3,163 Democratic state legislators in the country. Democrats are clearly unified in support of their candidate.
Trump has only 230 endorsements from incumbent Republican state legislators, which represent 5.6% of the 4,119 Republican state legislators. The Republican party is unified at the state legislator level — in not endorsing Donald Trump. While I don’t have the numbers for previous elections to back it up, my subjective memory and interpretation is that this number is pretty much unprecedented.