Montgomery, Ala. Former U.S. Rep. Parker Griffith of Huntsville is running for governor as a Democrat.
Griffith turned in his qualifying papers at state party headquarters in Montgomery shortly before the deadline on Friday.
Griffith served as a Democrat in the Alabama Senate and then was elected to Congress to represent part of north Alabama.
After his election he switched to the Republican Party and lost a GOP primary bid to Mo Brooks, who now represents the 5th District.
Griffith recently rejoined the Democratic Party.
Businessman and former minor league baseball player Kevin Bass of Fayette previously announced he's seeking the Democratic nomination for governor.