Stunning isn’t it?
Another little known item....’legal’ aliens with green cards are allowed to vote in most municipal elections.
[snip]Voting
One of the most important privileges of democracy in the United States of America is the right to participate in choosing elected officials through voting. As a Permanent Resident you can only vote in local and state elections that do not require you to be a US citizen
http://www.ailc.com/howdoi/PermRes.htm
Replace "most" with "a few oddball". An occasional California city will allow non-citizen residents to vote in local elections, but they are very much the exceptions to the general rule.