CREATE TABLE table_41368 ("Party" CLOB, "Marplan" CLOB, "Gallup" CLOB, "National Opinion Polls  ( NOP ) " CLOB, "Opinion Research Centre  ( OPC ) " CLOB, "Harris" CLOB)

What is Party, when Opinion Research Centre (OPC) is 1.5%?
SELECT "Party" FROM table_41368 WHERE "Opinion Research Centre (OPC)" = '1.5%'
SELECT "Party" FROM "table_41368" WHERE "Opinion Research Centre (OPC)" = '1.5%'