This paper examines political defection and the consequent fear that the polity may slide into a one-party state. Nigeria practices a multi-party system of constitutional democracy, and politicians identify with political parties of their choice for the purpose of electoral contestation. Occasions are bound where members of the political class cross-carpet to another political party to advance the course of their political career. The appraisal of the issue employs the doctrinal methodology with the utilization of statutory law, subsidiary legislations, case-law, books, journals, and newspapers. A comparative approach of analysis was also taken advantage of to take advantage of what obtains in another emerging constitutional democracy. The findings have demonstrated the availability of defection by elected federal and state legislators and the constitutional silence on defection in respect of other categories of elected representatives. The finding that political defection has sometimes been propelled by the ruling party to boost its membership and political capital appears germane. The paper advocates the passage of political defection into history and the adoption of ideological stances by registered political parties.