user: Question: Who is the incumbent that is listed with the candidates listed as Marilyn Lloyd (D) 57.4% Harold W. Coker (R) 42.6%?
Columns: ['District', 'Incumbent', 'Party', 'First elected', 'Result', 'Candidates']
Types: ['text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Tennessee 1', 'Jimmy Quillen', 'Republican', 1962.0, 'Re-elected', 'Jimmy Quillen (R) 80.2% Sidney S. Smith (D) 19.8%']
SQL:

assistant: SELECT "Incumbent" FROM "Table" WHERE "Candidates" = 'Marilyn Lloyd (D) 57.4% Harold W. Coker (R) 42.6%';