user: Question: Which Ipsos 5/25/09 has a TNS-Sofres 5/28/09 of 20%?
Columns: ['Party', 'Results 2004', 'CSA 5/14/09', 'Viavoice 5/15/09', 'Ifop- La Croix 5/15/09', 'Ipsos 5/16/09', 'OpinionWay 5/18/09', 'CSA 5/20/09', 'Ipsos 5/25/09', 'TNS-Sofres 5/26/09', 'OpinionWay 5/28/09', 'TNS-Sofres 5/28/09']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['UMP - NC', '16.64%', '28%', '27%', '26%', '28%', '28%', '26%', '26%', '26%', '26%', '26%']
SQL:

assistant: SELECT "Ipsos 5/25/09" FROM "Table" WHERE "TNS-Sofres 5/28/09" = '20%';