The proper noun ‘Labor’ is spelled that way as a tribute to the American labor movement.
The word ‘labour’ in every day use is spelled the British way
As an American I would like to say that I’m sorry America, even in a small way, is responsible for the spelling of the name of a political party “Labor” that has done so much to destroy a faithful ally of the United States!
BTW, if you guys are successful in driving out the Left from the government of Australia, could a conservative Republican Yank like myself obtain political asylum in “Oz?”
After all, I do live in a semi-Communist country on its way to the REAL THING.