Former Australian prime pinister Kevin Rudd tells Tom Clark if Canada wants a seat atthe UN Security Council, the country must continue international engagement.

Australians on Saturday were facing an election choice of two relatively unpopular and uninspiring leaders. But they were flocking to the polls, nonetheless - because, by law, they have to.

Prime Minister Kevin Rudd has mounted a spirited defence of his support for gay marriage only days out from Australian elections.