The practice of denying the vote to felons even after their sentence is complete — the basis of the discriminatory Crosscheck system — really ought to be ruled unconstitutional. It exploits a loophole of the 14th amendment in a way clearly not intended by its crafters, and acts as a substitute for the “poll tax” practice abolished by the 24th amendment.
Misuses of felon lists to block voting have already been ruled illegal in several states by several courts, specifically because they target minorities (as forbidden by amendment 14), yet they persist in the abuse. We need to cut the whole thing out at the root, which is the state laws under which felons lose their voting rights permanently. These laws turn biased law enforcement into a tool of deliberate disenfranchisement.