Testing the limits of partisan gerrymandering

In the 2012 elections, Republicans in Wisconsin won 60 of the 99 Assembly seats, despite Democrats having a majority of the statewide vote. The disparity lead to the federal lawsuit Gill v. Whitford, in which plaintiffs alleged that voting districts were gerrymandered unconstitutionally. On Tuesday, in what may be a landmark case, the Supreme Court will hear arguments in the case. PBS NewsHour Special Correspondent Jeff Greenfield reports.