Joe Biden: 
1990s: Supported tough-on-crime; 2019:considers those racist.

Cory Booker:
Make lynching a hate crime. 
Rich-and-guilty treated better than poor-and-innocent. 

Pete Buttigieg:
Restore voting rights for ex-cons, but not those in prison.
Death penalty is racist; mandatory minimums too. 

Beto O`Rourke:
1995 burglary arrest charges dropped by U. Texas. 
Expand death penalty if police officers are attacked. 
Capital punishment is an inequitable, unfair, unjust system.

Source: OnTheIssues.org