I live in Oklahoma, and this is most of the answer.

The reason for that is it's intentionally difficult to vote if you have a job. A lot of managers won't give you time even if they are supposed to. The polling places are typically churches, or old folks homes. My polling place is a nursing home, and every time I vote, there is a line of people who can barely remember their own name getting ready to vote, and it's easy for them because they live there.