user: Question: What was Democrat: Tom Harkin's percentage when the poll source was Rasmussen Reports and the lead margin was 14?
Columns: ['Poll Source', 'Dates administered', 'Democrat: Tom Harkin', 'Republican: Christopher Reed', 'Lead Margin']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['Survey USA', 'October 28-October 29, 2008', '61%', '35%', 26.0]
SQL:

assistant: SELECT "Democrat: Tom Harkin" FROM "Table" WHERE "Poll Source" = 'Rasmussen Reports' AND "Lead Margin" = 14.0;