CREATE TABLE table_5596 ("Date Released" CLOB, "Institute" CLOB, "Socialist" CLOB, "Social Democratic" CLOB, "Green-Communist" CLOB, "Left Bloc" CLOB, "People's Party" CLOB, "Lead" CLOB)

Name the lead with left bloc of 8.4%
SELECT "Lead" FROM table_5596 WHERE "Left Bloc" = '8.4%'
SELECT "Lead" FROM "table_5596" WHERE "Left Bloc" = '8.4%'