This whole idea of requiring people to present photo ID to vote is bad news indeed for a lot of kinds of people, but especially for transgender ones, who, in exchange for expressing their right to vote, will have to deal with harassment, denial of suffrage, and lack of representation.
Because what exactly it takes to get a gender marker in your lived gender if you are trans varies from state to state.
But more important, as Alex Blaze points out, the whole idea is to suppress the vote of people who are most likely to be intimidated by needing an ID card & by the voting process in general.