user: Question: How many partys have a candidate first elected in 1923?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['North Carolina 2', 'John H. Kerr', 'Democratic', 1923.0, 'Re-elected', 'John H. Kerr (D) Unopposed']
SQL:

assistant: SELECT COUNT("Party") FROM "Table" WHERE "First elected" = 1923.0;