floor-crossing
n.— «The fact that SA had the window of opportunity for floor crossing adds further value to this democracy every citizen has the right to choose the party they wanted to go to, and nobody is suppressed.» —“Zuma Seeks to Dispel Fears About One-Party State” by Chris Van Gass in Cape Town Business Day (Johannesburg, S. Africa) Sept. 8, 2004. (source: Double-Tongued Dictionary)