The RP did manage to secure around 20% of the white vote nationally on a regular basis and it would pick up most of the non-white constituency votes, but the first-past-the-post electoral system meant that they never won seats in the Assembly. Widespread press censorship and government control of radio and TV inhibited opposition activity. The lack of an effective parliamentary opposition is one factor that made it difficult to end UDI when this measure had become clearly necessary.