When a senior MP walks out of his party four months before a general election, he makes it obvious he does not like its chances. Shane Jones has done Labour no favours by quitting so late in the day. If his unsuccessful bid for the leadership last year was decisive for him, he would have left at the end of the year, or perhaps after reflecting over the summer break.
Instead, he came roaring back to Parliament in February, accusing the supermarket chain Progressive Enterprises of extortionate dealings with local suppliers and prompted the Commerce Commission to announce an inquiry. He was outshining his party's chosen leader, David Cunliffe, and looking every inch the leader it should have chosen. But over Easter he decided to pack it in.
Sometimes it is the prospect of success that prompts a person to re-assess his career. If the coming election turns out badly for Labour there is every prospect it will blame Mr Cunliffe and look for a new leader. Mr Jones had to consider whether he really wanted to be that leader. He stood for the job last year without much hope of success. He seemed less than serious, almost a self-parody at times. But in standing he put the hotel porn incident behind him and restored the high expectations once held for him in politics.
He had been called a future Prime Minister. Mr Jones had the stature and personality to compare with Labour's Norman Kirk and David Lange. But he has not looked comfortable in the Labour Party for a long time.
He is a no-nonsense believer in industry and jobs, not the environmental causes, gender balances and diverse identity politics of Labour today.