Article III is unambiguous, and means exactly what it says. It creates both necessary and sufficient requirements for qualified voters. Every United States citizen 18 years of age or older who resides in an election district in Wisconsin is a qualified elector in that district, unless excluded by duly enacted laws barring certain convicted felons or adjudicated incompetents/partially incompetents.

The government may not disqualify an elector who possesses those qualifications on the grounds that the voter does not satisfy additional statutorily-created qualifications not contained in Article III, such as a photo ID.