the voting rights act is, in its entirety, obviously constitutional under the 15th amendment, which gives congress broad and proactive authority to stop racial discrimination in voting. and you know it is obviously constitutional because roberts has had to invent entire new doctrines to gut it.
The Supreme Court knocked down one of the two pillars of the Voting Rights Act in 2013 in the Shelby County case. It has now gone out of its way to consider whether it should knock down the other, by rescheduling arguments in a case it could have resolved in June under existing precedent.