In 1980, the "Parti Québécois" launched a referendum on the question of sovereignty. The question actually asked whether Quebec should negotiate for sovereignty, not whether Quebec should simply declare independence, but it was vaguely worded and confused many voters. Trudeau, although it was not a federal referendum, supported the "no" side, promising constitutional reform. The "no" side won by a margin of 60% to 40% when the question was put to the voters on the 20th of May.