After a fiercely fought contest in the first round of France’s presidential election, the independent left candidate, Emmanuel Macron, and the right’s Marine Le Pen will contest the run-off election on May 7. Under the French Constitution, presidential elections are conducted via run-off voting to ensure that the elected president obtains a majority. If no candidate receives a majority of votes in the first round of voting, the two highest-scoring candidates contest a run-off. …