user: Question: Who were the candidates in district Wisconsin 4?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Results', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Wisconsin 1', 'Mark Neumann', 'Republican', 1994.0, 'Retired to run for U.S. Senate Republican hold', 'Paul Ryan (R) 57.1% Lydia Spottswood (D) 42.7%']
SQL:

assistant: SELECT "Candidates" FROM "Table" WHERE "District" = 'Wisconsin 4';