user: Question: Which poll source had an other of 15%?
Columns: ['Poll source', 'Dates administered', 'Jim DeMint (R)', 'Alvin Greene (D)', 'Tom Clements (G)', 'Other', 'Undecided']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Rasmussen Reports', 'October 19, 2010', '58%', '21%', '––', '15%', '6%']
SQL:

assistant: SELECT "Poll source" FROM "Table" WHERE "Other" = '15%';