The NDP primarily attracted left-wing Labor Party voters who were disillusioned with Bob Hawke's pro-nuclear stance. At the 1984 federal election, the NDP polled 7.23 percent of the total Senate vote, electing Jo Vallentine as a senator for Western Australia. However, Vallentine resigned from the party before taking her seat, due to allegations of a takeover by Trotskyists affiliated with the Socialist Workers Party. The NDP's vote collapsed to 1.1 percent at the 1987 election – a double dissolution. Robert Wood was elected as a senator for New South Wales, but after less than a year in office was disqualified by the Court of Disputed Returns and replaced by Irina Dunn. However, Dunn was expelled from the party after less than a month in office, and like Vallentine served out the rest of her term as an independent.