For the purposes of this market, I will count anyone as an atheist if any of the following things are true of them:

• They use the word "atheist" to describe themselves.

• They say that they don't believe in God, they don't use an alternative label like "agnostic", and they don't object to the word atheist being used to describe them.

• They use an alternative label to describe their nonbelief, but it describes a form of nonbelief stronger than agnosticism (e.g., igtheism)

This market resolves to the earliest decade in which an atheist takes office as president of the United States, or the president becomes an atheist while in office.