Shane Jones' shock decision to quit as a Labour MP will lead voters to draw one conclusion and one conclusion only: that he thinks Labour cannot win the September general election.
His departure is close to an unmitigated disaster for Labour. For starters, unlike the bulk of his colleagues, Jones could reach into segments of the vote - especially blue-collar males - who have switched off Labour. He was in the process of switching those traditional relationships back on.
Read more: Jones shocks Labour by quitting
He was a major weapon in helping Labour to win back more of the Maori seats.
Perhaps of most significance, Labour has lost the one man who would have acted as the essential go-between in securing Winston Peters' signature on a post-election coalition or co-operation agreement between Labour and New Zealand First which enabled Labour to govern.