Purcell v. Gonzalez (2006)
As Arizona voters headed to the polls, the Supreme Court intervened in a voting-rights case, warning that federal courts should not alter election rules on the eve of a vote. The case gave rise to the "Purcell principle" — the presumption against last-minute election changes.
The Court vacated the lower court's injunction, letting existing rules stand for that election.
The principle is now a standard the Court applies in election-law emergencies, often invoked to avoid disrupting settled rules near voting.
The FCC and its allies echo Purcell, arguing that forcing a campaign-finance decision days before the midterms would disrupt settled rules "in the hot breath of an impending election."
