user: Question: What was the incumbent for Texas 19?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Texas 1', 'Sam B. Hall', 'Democratic', 1976.0, 'Re-elected', 'Sam B. Hall (D) 78.1% Fred Hudson (R) 21.9%']
SQL:

assistant: SELECT "Incumbent" FROM "Table" WHERE "District" = 'Texas 19';