I’m on the road this weekend to attend a family Seder, which our family makes something of a movable feast . . . By coincidence, Gail Collins’ NYT column, noting the coincidence of Easter and Passover this week, adds this: “Americans with less religious inclinations can look forward to the upcoming Earth Day celebrations, when the president is planning to do something as yet unannounced, but undoubtedly special, and Arbor Day, when rumor has it that he will not just plant a tree, but personally reforest a large swath of the nation of Mali.” Collins writes with tongue somewhat-in-cheek, but...