Under typical circumstances, this wouldn't be such a big deal. But Scalia, the court's most influential conservative, died in President Obama's final year in office, in the middle of the court's term, with the candidates to succeed him fighting through the early primary season. That makes this high court vacancy particularly complicated — and divisive. Almost immediately after Scalia's death became public, Obama announced his intention to nominate a successor himself. All but one of the the six Republican presidential candidates at Saturday's GOP debate in South Carolina said Obama should either not nominate a justice and leave the decision...