Answer:
It is possible for a president to make a "mistake" when appointing a Supreme Court justice if the appointee does not share the president's ideological leanings. This could be due to the appointee not being as qualified as the president thought, or because the appointee was not able to uphold the president's ideals. In either case, the president may find that the justice appointed does not hold the same values or opinions as them and this can be seen as a miscalculation on their part
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