How many incumbents were elected in the 1926 election?
{'header': ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates'], 'page_title': 'United States House of Representatives elections, 1942', 'section_title': '', 'caption': '', 'rows': [['Georgia 1', 'Hugh Peterson', 'Democratic', '1934', 'Re-elected', 'Hugh Peterson (D) 98.2% H. W. Sheppard (I) 1.8%'], ['Georgia 2', 'Edward E. Cox', 'Democratic', '1924', 'Re-elected', 'Edward E. Cox (D) 100.0% Joe Baker (I) 0.03%'], ['Georgia 3', 'Stephen Pace', 'Democratic', '1936', 'Re-elected', 'Stephen Pace (D) Unopposed'], ['Georgia 6', 'Carl Vinson', 'Democratic', '1914', 'Re-elected', 'Carl Vinson (D) Unopposed'], ['Georgia 7', 'Malcolm C. Tarver', 'Democratic', '1926', 'Re-elected', 'Malcolm C. Tarver (D) Unopposed'], ['Georgia 8', 'John S. Gibson', 'Democratic', '1940', 'Re-elected', 'John S. Gibson (D) Unopposed']]}