What candidates ran in the election that included john shelley?
{'header': ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates'], 'page_title': 'United States House of Representatives elections, 1956', 'page_id': '', 'types': ['text', 'text', 'text', 'real', 'text', 'text'], 'id': '1-1341973-6', 'section_title': '', 'caption': '', 'rows': [['California 2', 'Clair Engle', 'Democratic', '1943', 'Re-elected', '√ Clair Engle (D) Unopposed'], ['California 5', 'John Shelley', 'Democratic', '1949', 'Re-elected', '√ John Shelley (D) Unopposed'], ['California 14', 'Harlan Hagen', 'Democratic', '1952', 'Re-elected', '√ Harlan Hagen (D) 63.0% Myron D. Tisdel (R) 37.0%'], ['California 23', 'Clyde Doyle', 'Democratic', '1948', 'Re-elected', '√ Clyde Doyle (D) 70.9% E. Elgie Calvin (R) 29.1%'], ['California 27', 'Harry R. Sheppard', 'Democratic', '1936', 'Re-elected', '√ Harry R. Sheppard (D) Unopposed']], 'name': 'table_1341973_6'}