How many were first elected when the incumbent was Morgan M. Moulder?
{'header': ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates'], 'page_title': 'United States House of Representatives elections, 1950', 'section_title': '', 'caption': '', 'rows': [['Missouri 1', 'Clare Magee', 'Democratic', '1948', 'Re-elected', 'Clare Magee (D) 54.4% Samuel W. Arnold (R) 45.6%'], ['Missouri 2', 'Morgan M. Moulder', 'Democratic', '1948', 'Re-elected', 'Morgan M. Moulder (D) 53.0% Max Schwabe (R) 47.0%'], ['Missouri 3', 'Phil J. Welch', 'Democratic', '1948', 'Re-elected', 'Phil J. Welch (D) 51.1% William C. Cole (R) 48.9%'], ['Missouri 7', 'Dewey Short', 'Republican', '1934', 'Re-elected', 'Dewey Short (R) 58.7% Daniel J. Leary (D) 41.3%'], ['Missouri 9', 'Clarence Cannon', 'Democratic', '1922', 'Re-elected', 'Clarence Cannon (D) 61.4% John H. Fahien (R) 38.6%']]}