Question: What is Party, when Opinion Research Centre (OPC) is 1.5%?
SQL: SELECT "Party" FROM "2-159614-2" WHERE "Opinion Research Centre (OPC)" = '1.5%';

Question: What is Marplan, when Gallup is 1.5%
SQL: SELECT "Marplan" FROM "2-159614-2" WHERE "Gallup" = '1.5%';

Question: What is Opinion Research Centre (OPC), when Party is Conservative?
SQL: SELECT "Opinion Research Centre (OPC)" FROM "2-159614-2" WHERE "Party" = 'Conservative';

Question: What is Harris, when Marplan is 1.3%
SQL: SELECT "Harris" FROM "2-159614-2" WHERE "Marplan" = '1.3%';