Cordell Hull is the incumbent in how many districts?
{'header': ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates'], 'page_title': 'United States House of Representatives elections, 1924', 'section_title': '', 'caption': '', 'rows': [['Tennessee 2', 'J. Will Taylor', 'Republican', '1918', 'Re-elected', 'J. Will Taylor (R) 96.3% Mitchell Long (D) 3.7%'], ['Tennessee 4', 'Cordell Hull', 'Democratic', '1922', 'Re-elected', 'Cordell Hull (D) Unopposed'], ['Tennessee 5', 'Ewin L. Davis', 'Democratic', '1918', 'Re-elected', 'Ewin L. Davis (D) 81.7% Abe Davidson (R) 18.3%'], ['Tennessee 6', 'Joseph W. Byrns, Sr.', 'Democratic', '1908', 'Re-elected', 'Joseph W. Byrns, Sr. (D) Unopposed'], ['Tennessee 7', 'William Charles Salmon', 'Democratic', '1922', 'Retired Democratic hold', 'Edward Everett Eslick (D) Unopposed'], ['Tennessee 8', 'Gordon Browning', 'Democratic', '1922', 'Re-elected', 'Gordon Browning (D) Unopposed']]}