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Cook was one of 35 Labour members elected at the 1891 New South Wales colonial election and was the leader of the Parliamentary Labour Party from 1893. The party was divided on the question of free trade or protectionism, with Cook on the side of free trade, but increasingly at odds with the party. The party decided that members must sign a "pledge" to be bound by decisions of the Caucus and Cook was the leader of those parliamentarians who refused to sign, contesting the 1894 election as an Independent Labour candidate. Cook's decision, immediately after the election, to join the Free Trade ministry under George Reid was seen as an opportunistic act which saw Cook labeled as a class traitor.
Ordinarily the writ for a by-election would be issued by the Speaker of the Legislative Assembly, however the ministers were appointed before Parliament convened and the writs were issued by the Governor.
Estimate based on a roll of 2,031 at the 1894 election.