The words "It's Time" have become an important contribution to the lexicon of Labor's constituency since their first use in Blacktown in 1972. An updated version of the "It's Time" song was used in advertisements for the 'Yes' vote in the republic referendum in 1999, which ended with Whitlam saying: "Yes. It's time." In 2000, after another period of Liberal dominance, the phrase had an unsuccessful short-lived recurrence, with Whitlam speaking on behalf of the Leader of the Labor Party, Kim Beazley. Labor's 2015 Marriage Equality initiative used the phrase "It's Time. Marriage Equality".