A lot of Leftists claim to admire Darwin, and yet adhere to very anti-Darwinian notions of human equality (both among individuals and among groups of people) and blank slate models for the human mind. I guess they believe that human beings evolved, but then evolution just stopped and we all became equal.
Yep. That's about it.
Though of course "right wingers" who make an idol out of inequality to the point that they throw A-mighty G-d out of the picture and choose to deify genes and chromosomes are just as bad.