24th amendment, anyone?

The forgotten constitutional amendment about voting rights. - By Bruce Ackerman and Jennifer Nou - Slate Magazine:

Indiana's law insists on a photo ID to vote, which in turn requires documents, like a birth certificate or passport, that verify identity. Getting these papers costs voters money as well as time and effort. This leads to the question the court failed to ask: Does the extra expense violate the absolute ban on all 'taxes' imposed by the 24th Amendment?