Sunday on NewsHour Weekend: Political experts weigh in on the long road ahead for the presidential candidates. Also, a revealing look at Pope John Paul II's private correspondence with philosopher Teresa Timenyeska. Later, how using drones in Tornado Alley is…

Saturday on NewsHour Weekend: The nation pays its respects to Supreme Court Justice Antonin Scalia. Also, presidential contests take place in Nevada for the Democrats and in South Carolina for the Republicans. Later, the economic and social impacts when Wal-Mart…

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