CREATE TABLE "opinion_polling_for_the_united_states_gu" (
  "poll_source" text,
  "dates_administered" text,
  "democrat_brian_schweitzer" text,
  "republican_roy_brown" text,
  "libertarian_stan_jones" text,
  "lead_margin" real
);

Question: What was the lead margin when Schweitzer had 55% and Jones had 2%?
SQL: SELECT SUM("lead_margin") FROM "opinion_polling_for_the_united_states_gu" 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 "opinion_polling_for_the_united_states_gu" WHERE "lead_margin"=26;

Question: What is the percentage for Schweitzer when the lead margin is 29?
SQL: SELECT "democrat_brian_schweitzer" FROM "opinion_polling_for_the_united_states_gu" 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 "opinion_polling_for_the_united_states_gu" WHERE "democrat_brian_schweitzer"='55%' AND "libertarian_stan_jones"='not an option';