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You can check wikipedia for list of governors
http://en.wikipedia.org/wiki/List_of_state_governors_of_Nigeria
Individual states do not have presidents, they have governors. The governor of Arizona is Jan Brewer.
Governors for where... A school, a country, a bank..
Arizona only has one Governor at a time and in 2011 it is Jan Brewer.
The State of Alabama has had 52 Governors. You can find the complete list on Wikipedia at: http://en.wikipedia.org/wiki/List_of_Governors_of_Alabama