love

A friend once asked me to take a look at a riddle he'd come across in some computer game he was playing at the time (I think it was King's Quest VI or something). He had to solve this riddle to open the gates of hell.

My first is foremost legally.
My second circles outwardly.
My third leads all in victory.
My fourth twice ends a nominee.
My whole is this gate's only key.

(As I have a good sense of sarcasm I solved it in two minutes.)