What year was first elected william m. wheeler (d) unopposed?
{'header': ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates'], 'page_title': 'United States House of Representatives elections, 1948', 'section_title': '', 'caption': '', 'rows': [['Georgia 1', 'Prince Hulon Preston, Jr.', 'Democratic', '1946', 'Re-elected', 'Prince Hulon Preston, Jr. (D) Unopposed'], ['Georgia 2', 'Edward E. Cox', 'Democratic', '1924', 'Re-elected', 'Edward E. Cox (D) Unopposed'], ['Georgia 3', 'Stephen Pace', 'Democratic', '1936', 'Re-elected', 'Stephen Pace (D) Unopposed'], ['Georgia 4', 'Albert Sidney Camp', 'Democratic', '1939', 'Re-elected', 'Albert Sidney Camp (D) Unopposed'], ['Georgia 5', 'James C. Davis', 'Democratic', '1946', 'Re-elected', 'James C. Davis (D) Unopposed'], ['Georgia 6', 'Carl Vinson', 'Democratic', '1914', 'Re-elected', 'Carl Vinson (D) Unopposed'], ['Georgia 7', 'Henderson Lovelace Lanham', 'Democratic', '1946', 'Re-elected', 'Henderson Lovelace Lanham (D) Unopposed'], ['Georgia 8', 'William M. Wheeler', 'Democratic', '1946', 'Re-elected', 'William M. Wheeler (D) Unopposed'], ['Georgia 9', 'John Stephens Wood', 'Democratic', '1944', 'Re-elected', 'John Stephens Wood (D) Unopposed']]}