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I actually think the Supreme Court got it right in the Arizona case. Yes, the Constitution says legislatures set the "time, place, and manner" of the elections, but does that automatically extend to drawing district lines? I would argue that it does not -- that the requirement is satisfied by allowing the legislature to establish the date and time of the election, a mechanism for setting up polling places, and the form (secret or open ballot, paper or electronic form) for electing officials. The people may establish a different form for actually designing the districts.