Labor’s political woes have deepened with the left-wing union that helped install Joe Bullock to the top of the party’s WA Senate ticket calling on the freshly elected Senator to resign.

Six days after the party suffered a five per cent swing against it in WA Senate re-run, United Voice declared Mr Bullock was no longer “fit to represent the ALP in the Australian Senate” in light of “appalling” comments he made about the Labor Party and fellow WA Senate candidate Louise Pratt in a speech late last year.

Labor's winning candidate Joe Bullock Credit:Aaron Bunch

The comments came as former foreign minister Bob Carr was labelled “arrogant” and “foolish” for publishing intimate details of his 18 months in cabinet in his book Bob Carr: Diary of a Foreign Minister.

Mr Bullock was forced to apologise to all Labor members on the eve of last week’s election after it emerged he had attacked the party in a speech to Christian group the Dawson Society last November.