Indeed, the examples are everywhere-- voting age, speed limit, etc. etc.
In any event, whether Blackmun adopted the trimester formula or some other formula is entirely immaterial, in my opinion. The very idea that the Constitution protects abortion at any stage--whether during the first trimester or the last--is utterly revolting.
Blackmun was perhaps the dumbest Justice on the Supreme Court in the last fifty years.
Even the hard core liberals on the court who served with him had contempt for him.
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