Table schema:
CREATE TABLE table_name_55 (appointed_by VARCHAR, title VARCHAR, representative VARCHAR)

Question: What is the Appointed by that has the Title of Ambassador Extraordinary and Plenipotentiary and has a Representative of Spruille Braden?
SQL: SELECT appointed_by FROM table_name_55 WHERE title = "ambassador extraordinary and plenipotentiary" AND representative = "spruille braden"