user: Question: how many party classifications are there for the incumbent Mac Collins? 
Columns: ['District', 'Incumbent', 'Party', 'Elected', 'Status', 'Result']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ["Georgia's 1st", 'Jack Kingston', 'Republican', 1992.0, 'Re-elected', 'Jack Kingston (R) 69% Joyce Marie Griggs (D) 31%']
SQL:

assistant: SELECT COUNT("Party") FROM "Table" WHERE "Incumbent" = 'Mac Collins';