I agree Democrats are pushing for reform today (and some sentencing reform was passed when they controlled Congress in 2010). Republicans [1] and conservative think-tanks [2] today are also actively fighting for sentencing reform. Tt's one of the few issues that are bi-partisan today. You can make a judgment based on how you've ascertained the composition of political cockwalking, but in the end, it's the actual laws that get passed that put people in prison.
[0] https://www.brookings.edu/blog/fixgov/2016/04/08/addressing-...
[1] https://www.govtrack.us/congress/bills/114/s2123
[2] http://thehill.com/blogs/blog-briefing-room/228145-charles-k...
In the 90s it was urban blacks clamouring for harsher law enforcement, since it was their neighbourhoods which were suffering the effects of drug-related violence and other crimes.
Blacks aren't really liberal or leftist on the whole, but they consistently support the left-wing party.
* even referring to them all as "blacks" blurs the significant difference between African-Americans who trace their heritage to American slavery, and contemporary immigrant/refugee communities from Somalia, etc.
> I remember [this one anecdote]