user: Question: What is the party affiliation of Thomas D. Waterman, whose appointing governor is Terry Branstad?
Columns: ['Name', 'Appointed/Elected', 'Term expires', 'Appointing Governor', "Governor's Party Affiliation"]
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Chief Justice Mark Cady', '1998', 'December 31, 2016', 'Terry Branstad', 'Republican']
SQL:

assistant: SELECT "Governor's Party Affiliation" FROM "Table" WHERE "Appointing Governor" = 'Terry Branstad' AND "Name" = 'Thomas D. Waterman';