One challenge has already been decided by a court (dismissed), and six candidates have withdrawn. Per the AZSOS, 18 cases are pending (caveat: some of those cases may yet be consolidated and at least one involves a candidate who has withdrawn as the result of another case)
From the Arizona Secretary of State -
So far, the "biggest" name to withdraw is Christopher Ajluni, the No Labels candidate in CD1. I expect that to change as the challenge process grinds on.
