user: Question: How many districts had results related to incumbent Toby Roth?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Wisconsin 1', 'Mark Neumann', 'Republican', 1994.0, 'Re-elected', 'Mark Neumann (R) 51% Lydia Spottswood (D) 49%']
SQL:

assistant: SELECT COUNT("Result") FROM "Table" WHERE "Incumbent" = 'Toby Roth';