How many instances are there of party in the situation where Robert Bauman is the incumbent politician?
CREATE TABLE table_18355 (
    "District" text,
    "Incumbent" text,
    "Party" text,
    "First elected" real,
    "Result" text,
    "Candidates" text
)
SELECT COUNT("Party") FROM table_18355 WHERE "Incumbent" = 'Robert Bauman'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many instances are there of party in the situation where Robert Bauman is the incumbent politician? ### Input: CREATE TABLE table_18355 (
    "District" text,
    "Incumbent" text,
    "Party" text,
    "First elected" real,
    "Result" text,
    "Candidates" text
) ### Response: SELECT COUNT("Party") FROM table_18355 WHERE "Incumbent" = 'Robert Bauman'