The Realignment reference article from the English Wikipedia on 24-Apr-2004
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Realignment

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In political science, electoral realignment is a signficant lasting change in the arrangement of political forces. In American politics, this term is used to refer to a change in the voting blocs that support either side in the two-party system.

Several eras and events are often identified as occasions when realignment took place. They include

V.O. Key Jr identified realignments as occuring during "critical elections." Other scholars to cover this matter include Jerome M. Chubb, William H. Flanigan, and Nancy H. Zingale in Partisan Realigment: Voters, Parties, and Government in American History (1980) and James L. Sundquist in Dynamics of the Party System: Alignment and Realignment of Political Parties in the United States.