Table: euro_parl_2009_port_2
Columns: date_released
institute
socialist
social_democratic
green_communist
left_bloc
people_s_party
lead

Question: Name the people's party for social democratic of 30.1%
SQL: SELECT "people_s_party" FROM euro_parl_2009_port_2 WHERE "social_democratic" = '30.1%'

Question: Name the lead with left bloc of 8.4%
SQL: SELECT "lead" FROM euro_parl_2009_port_2 WHERE "left_bloc" = '8.4%'

Question: Name the lead for institute of election results and social democratic of 31.7% 8 seats
SQL: SELECT "lead" FROM euro_parl_2009_port_2 WHERE "institute" = 'election results' AND "social_democratic" = '31.7% 8 seats'