user: Question: How many instances are there of party in the situation where Robert Bauman is the incumbent politician?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Maryland 1', 'Robert Bauman', 'Republican', 1973.0, 'Re-elected', 'Robert Bauman (R) 53.0% Thomas J. Hatem (D) 47.0%']
SQL:

assistant: SELECT COUNT("Party") FROM "Table" WHERE "Incumbent" = 'Robert Bauman';