Table: gubernatorial_polls_2008_4
Columns: poll_source
dates_administered
democrat_brian_schweitzer
republican_roy_brown
libertarian_stan_jones
lead_margin

Question: What was the lead margin when Schweitzer had 55% and Jones had 2%?
SQL: SELECT SUM("lead_margin") FROM gubernatorial_polls_2008_4 WHERE "democrat_brian_schweitzer" = '55%' AND "libertarian_stan_jones" = '2%'

Question: What is the percentage for Brown when the lead margin is 26?
SQL: SELECT "republican_roy_brown" FROM gubernatorial_polls_2008_4 WHERE "lead_margin" = 26

Question: What is the percentage for Schweitzer when the lead margin is 29?
SQL: SELECT "democrat_brian_schweitzer" FROM gubernatorial_polls_2008_4 WHERE "lead_margin" = 29

Question: What is the largest lead margin when Schweitzer has 55% and Jones is not an option?
SQL: SELECT MAX("lead_margin") FROM gubernatorial_polls_2008_4 WHERE "democrat_brian_schweitzer" = '55%' AND "libertarian_stan_jones" = 'not an option'