CREATE TABLE table_name_57 (electorate NUMBER, name VARCHAR2, political_party VARCHAR2, constituency VARCHAR2)

What is the smallest electorate for the Conservative party in South West Devon constituency, with over 2 conservatives and a name of Plymstock Radford?
SELECT MIN(electorate) FROM table_name_57 WHERE political_party = "conservative" AND constituency = "south west devon" AND "conservative" > 2 AND name = "plymstock radford"
SELECT MIN("electorate") FROM "table_name_57" WHERE "conservative" = "political_party" AND "conservative" > 2 AND "constituency" = "south west devon" AND "name" = "plymstock radford"