Here’s a table from the liberal Sentencing Project thinktank’s 2007 report: “Uneven Justice: State Rates of Incarceration By Race and Ethnicity” by Marc Mauer and Ryan S. King.

As you can see, there’s a noticeable correlation between liberalism and racial inequality in incarceration, with the most unequal places including D.C. and Vermont, and the least unequal including Georgia, Mississippi, and Alabama. That’s not the only correlation going on, but it’s a sizable one.