user: Question: How many incumbents were elected in the 1926 election?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Georgia 1', 'Hugh Peterson', 'Democratic', 1934.0, 'Re-elected', 'Hugh Peterson (D) 98.2% H. W. Sheppard (I) 1.8%']
SQL:

assistant: SELECT COUNT("Incumbent") FROM "Table" WHERE "First elected" = 1926.0;