That's a roundabout argument and I don't think you can prove any criminal intent about that. Unless you can prove that the political process encourages the targeting of minorities, then it's just an enforcement issue. And not every state will ban you from voting for a non-violent offense.
It doesn't have to be "criminal" on the part of the law makers/enforcers to be a political issue - your bar is too high there. cf "institutionally racist"[1].
On the point of who bans you from voting, I think that's hardly the point - the types of crimes that are common in these communities are felonies.
