user: Question: How many candidates won the election in the district whose incumbent is Bud Shuster?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Pennsylvania 5', 'Richard T. Schulze', 'Republican', 1974.0, 'Re-elected', 'Richard T. Schulze (R) 67.2% Bob Burger (D) 32.8%']
SQL:

assistant: SELECT COUNT("Candidates") FROM "Table" WHERE "Incumbent" = 'Bud Shuster';