Affordable Care Act, LGBTQ rights, marijuana reform...not to mention a Black man was president, and a Black woman is the party nominee.
Yeah, it sucks that progress is so slow, and yeah, it sucks that some things have gone backwards. But there has been a huge amount of progress in the past however-many years. We went from "don't ask, don't tell" to having a Catholic president openly support gay marriage in a relatively short time.
Using Harris' Glock anecdote as evidence the party is moving to the right is just lazy editorializing IMHO. Almost as lazy as just asserting that the party is moving to the left because of the issues that you decided illustrate the left-right difference...