Safe is the opposite of Dangerous. Dangerous is a synonym of Risky. 
Campaign is related to Elect. Elect is related to Decision. Appointment is a type of Decision. Appointment is derived from Appoint. 
Safe <--Antonym--> Dangerous <--Synonym--> Risky 
Campaign <--RelatedTo--> Elect <--RelatedTo--> Decision <--IsA-- Appointment --DerivedFrom--> Appoint 