What is the minimum first elected for ed markey?
{'header': ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates'], 'page_title': 'United States House of Representatives elections, 1984', 'section_title': '', 'caption': '', 'rows': [['Massachusetts 1', 'Silvio Conte', 'Republican', '1958', 'Re-elected', 'Silvio Conte (R) 72.9% Mary L. Wentworth (D) 27.1%'], ['Massachusetts 2', 'Edward Boland', 'Democratic', '1952', 'Re-elected', 'Edward Boland (D) 68.7% Thomas P. Swank (R) 31.3%'], ['Massachusetts 4', 'Barney Frank', 'Democratic', '1980', 'Re-elected', 'Barney Frank (D) 74.2% Jim Forte (R) 25.8%'], ['Massachusetts 5', 'James Shannon', 'Democratic', '1978', 'Retired to run for U. S. Senate Democratic hold', 'Chester G. Atkins (D) 53.4% Greg Hyatt (R) 46.6%'], ['Massachusetts 7', 'Ed Markey', 'Democratic', '1976', 'Re-elected', 'Ed Markey (D) 71.4% S. Lester Ralph (R) 28.6%'], ['Massachusetts 8', "Tip O'Neill", 'Democratic', '1952', 'Re-elected', "Tip O'Neill (D) 91.9% Laura Ross ( C ) 8.1%"], ['Massachusetts 9', 'Joe Moakley', 'Democratic', '1972', 'Re-elected', 'Joe Moakley (D) Unopposed'], ['Massachusetts 10', 'Gerry E. Studds', 'Democratic', '1972', 'Re-elected', 'Gerry E. Studds (D) 55.7% Lewis Crampton (R) 44.3%']]}