Another Australian government minister quit on Friday in the fallout from a bungled leadership ballot that reinforced perceptions of a crisis in Prime Minister Julia Gillard’s administration six months before national elections.

“This is the honourable thing to do,” Chris Bowen told reporters after Ms. Gillard accepted his resignation as minister of tertiary education, skills, science and research.

Ms. Gillard already dumped the senior minister who forced her to call the leadership ballot before her expected challenger refuse to run. A junior minister and three officials within the centre-left Labour Party have departed as well.

Australian prime ministers are chosen by lawmakers within the ruling party, and a leadership change is often considered as a solution to abysmal opinion polling.

Former Prime Minister Kevin Rudd stunned many with the 11-hour announcement that he wouldn’t challenge her. His office said in a statement on Friday that “there are no circumstances under which he will return to the Labour Party leadership in the future.”

Ms. Gillard said on Friday she was surprised that Mr. Rudd hadn’t taken a shot at the top job. Part of Mr. Rudd’s appeal is that opinions polls show he is far more popular with voters than Gillard.

Senior minister Simon Crean, who brought the leadership crisis to a head by calling on his government colleagues to force a ballot, was sacked, and junior minister Richard Marles, a rising star who publically backed Mr. Rudd, resigned late on Thursday.

Another three Mr. Rudd supporters have resigned from senior positions within the party organization- Joel Fitzgibbon, Ed Husic and Janelle Saffin.

None has quit politics so the government’s slender parliamentary majority with the support of independents remains unchanged.

The government ranks are split over whether by avoiding a showdown with Ms. Gillard, Mr. Rudd had let down his supporters who have worked behind the scenes to undermine Ms. Gillard’s leadership in the face of the government’s likely defeat at national elections on Sept. 14.

“There’s a lot of people who feel very let down by his failure to run, a lot of people who have associated with him,” Cabinet minister Laurie Ferguson told Australian Broadcasting Corp. radio.

But Mr. Bowen said Mr. Rudd had done “the decent thing” by not forcing a divisive vote.

“We advised him that the ballot would be close, potentially very close, and we advised him that we could not guarantee an outcome,” Mr. Bowen said.

“He took the view that a divisive ballot which was close would not resolve the issue of the leadership and he didn’t want to put the Labour Party through that,” Mr. Bowen added.

More In: World | International | News