How many parties is Tom Foley a member of?
{'header': ['District', 'Incumbent', 'Party', 'Elected', 'Status', 'Opponent'], 'page_title': 'United States House of Representatives elections, 1990', 'page_id': '', 'types': ['text', 'text', 'text', 'real', 'text', 'text'], 'id': '1-1341568-48', 'section_title': 'Washington', 'caption': 'Washington', 'rows': [['Washington1', 'John Miller', 'Republican', '1984', 'Re-elected', 'John Miller (R) 52.0% Cynthia Sullivan (D) 48.0%'], ['Washington3', 'Jolene Unsoeld', 'Democratic', '1988', 'Re-elected', 'Jolene Unsoeld (D) 53.8% Robert Williams (R) 46.2%'], ['Washington4', 'Sid Morrison', 'Republican', '1980', 'Re-elected', 'Sid Morrison (R) 70.7% Ole H. Hougen (D) 29.3%'], ['Washington5', 'Tom Foley', 'Democratic', '1964', 'Re-elected', 'Tom Foley (D) 68.8% Marlyn Derby (R) 31.2%'], ['Washington6', 'Norman D. Dicks', 'Democratic', '1976', 'Re-elected', 'Norman D. Dicks (D) 61.4% Norman Mueller (R) 38.6%']], 'name': 'table_1341568_48'}