"In a weaker moment during the campaign I promised my team ... that if we won with an increased majority I'd get a tattoo," he told his supporters on Saturday night in Perth.

"No, I'm not getting Clarkson's postcode, as much as I'd like."

Mr Porter noted six months ago the election seemed difficult to win for the Liberals, with Labor tipped to steal five seats in WA.

"Every single commentator had written us off," he said.

But in a reference to television show Game of Thrones, Mr Porter said when looking into the face of political death "you say, not today".

The Attorney-General said he ran a local, grassroots campaign.

"We faced down everything they had to throw at us, every dollar that Get Up could raise from overseas," he said.

"They were sending out emails to ship people in from Fremantle to Sydney in this seat and we stood by each other."

Mr Porter also acknowledged his father during his victory speech.

"It doesn't matter how hard the task is or how insurmountable the odds might seem, or what the challenges might be that you're up against," he said.

"If you really, really work hard and you really, really commit yourself to it and your team to it, you can do it.

"I learnt that lesson growing up from my father, who did amazing things as an athlete.

"He's at home now and he's had his third round of chemo, but I'm sure that he is watching all of this and is very happy with what's gone on tonight."

Mr Porter thanked his team, including his wife, hugging and kissing her as the crowd of blue shirts cheered.

Australian Associated Press