He's trying to run an old Bill Clinton style "It's the Economy, Stupid" campaign. That doesn't mean he doesn't care about these issues or wouldn't do anything about them. Particularly voting rights, as that hurts Democrats so significantly. I agree he's coming off as a bit tone deaf, and he seems to be working on that at least somewhat, but part of why Clinton comes off as so polished is because she has a huge staff of advisors helping her always say just the right thing. And she's learned from her own tone deaf past. It doesn't necessarily mean she cares more.
I think either of them would be concerned about voting rights. And that's largely a SCOTUS issue. We really need someone who will appoint very liberal people to the SCOTUS. Both of them would.
An area of personal concern to me is abortion rights. I'm old enough that it isn't as much for me but because I have daughters. I know HRC talks much more about abortion rights, and I love that about her, but I don't believe Sanders would appoint anti-abortion Supreme Court justices. I'm sure he's very pro-choice too. Do I wish he'd talk about it a lot more? Yes! Abortion rights are fading and it scares me. But I know things would improve as much with him in office as with Clinton, despite it at least appearing to be a higher priority to her. It's about who gets appointed to the SCOTUS, and either of them would appoint a pro-choice candidate. In decided whom to vote for, I've tried to focus on things they'd do differently in office rather than things where it seems to me they'd do the same thing.