whistlersmother
Peace through strength
The biggest challenge to SCOTUS is states and localities ignoring its rulings, which happens regularly now.
Remember "contempt of court"? That only happens on old TV reruns.
The power of SCOTUS comes from everyone obeying its rulings. Once that has been broken, SCOTUS is nothing. I forsee states ignoring SCOTUS on both sides of the isle - both conservative on abortion and gay marriage and liberal on gun rights.