Not sure there is confusion at work. Legal non-citizen immigrants cannot vote in national elections. And usually not in local ones, either, according to the US

Not sure there is confusion at work. Legal non-citizen immigrants cannot vote in national elections. And usually not in local ones, either, according to the US Customs & Immigration Service: "There are very few jurisdictions where a non-U.S. citizen may vote in a local election." -- Wife of a green card holder