Who was Henry Hyde's opponent in the race?
{'header': ['District', 'Incumbent', 'Party', 'Elected', 'Status', 'Opponent'], 'page_title': 'United States House of Representatives elections, 1990', 'section_title': 'Illinois', 'caption': 'Illinois', 'rows': [['Illinois1', 'Charles Hayes', 'Democratic', '1983', 'Re-elected', 'Charles Hayes (D) 93.8% Babette Peyton (R) 6.2%'], ['Illinois2', 'Gus Savage', 'Democratic', '1980', 'Re-elected', 'Gus Savage (D) 78.2% William T. Hespel (R) 21.8%'], ['Illinois3', 'Marty Russo', 'Democratic', '1974', 'Re-elected', 'Marty Russo (D) 70.9% Carl L. Klein (R) 29.1%'], ['Illinois6', 'Henry Hyde', 'Republican', '1974', 'Re-elected', 'Henry Hyde (R) 66.7% Robert J. Cassidy (D) 33.3%'], ['Illinois7', 'Cardiss Collins', 'Democratic', '1973', 'Re-elected', 'Cardiss Collins (D) 79.9% Michael Dooley (R) 20.1%'], ['Illinois9', 'Sidney R. Yates', 'Democratic', '1964', 'Re-elected', 'Sidney R. Yates (D) 71.2% Herb Sohn (R) 28.8%'], ['Illinois15', 'Edward Rell Madigan', 'Republican', '1972', 'Re-elected', 'Edward Rell Madigan (R) unopposed'], ['Illinois17', 'Lane Evans', 'Democratic', '1982', 'Re-elected', 'Lane Evans (D) 66.5% Dan Lee (R) 33.5%'], ['Illinois20', 'Dick Durbin', 'Democratic', '1982', 'Re-elected', 'Dick Durbin (D) 66.2% Paul Jurgens (R) 33.8%']]}