American law operates under the doctrine of stare decisis, which means that prior decisions should be maintained -- even if the current court would otherwise rule differently. This however is not sacrosanct. The U.S. Supreme Court has overruled prior Supreme Court rulings many times:
Chisholm v. Georgia
Adler v. Board of Education
Pace v. Alabama
Wolf v. Colorado
Dred Scott v. Sandford
And on, and on.
Don't believe for an instant that the courts decision in District of Columbia v. Heller can't or won't be overruled by a future supreme court seeded with Obama appointees.
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