Table: us_senate_2008_polling
Columns: poll_source
dates_administered
democrat_dick_durbin
republican_steve_sauerberg
lead_margin

Question: Which poll put Dick Durbin at 56%?
SQL: SELECT "poll_source" FROM us_senate_2008_polling WHERE "democrat_dick_durbin" = '56%'

Question: What is Dick Durbin lead margin in the poll with 59%?
SQL: SELECT "lead_margin" FROM us_senate_2008_polling WHERE "democrat_dick_durbin" = '59%'

Question: Which poll source has a lead of 17?
SQL: SELECT "poll_source" FROM us_senate_2008_polling WHERE "lead_margin" = 17