Three leg race to replace a three legged duck

Perhaps there are simply three legs to any race, even if three's a crowd:

Leg 1: Speculation surrounding who will put themselves forward for leadership.

Leg 2: Hopefuls dropping out and rallying round their favourite.

Leg 3: One contender entering contest to draw support from one camp in order for another contender to sail through and win.

Don't look at me. You were also thinking it!