Maybe it wasn’t quite the equal of Versailles in the heydays of French monarchial extravagance. But the White House state dinner in honor of Mexico’s president certainly impressed the courtiers of the media. And why not? The gala social event did, after all, attract the top glitterati of Hollywood’s limousine liberal community. And as if that weren’t more than sufficient cause to ooh and ahh, First Lady Michelle Obama made her regal entrance garbed in — the gawking, star-struck media chroniclers tell us — “a one-shouldered, sky-blue gown by designer Peter Soronen, cinched at the waist with a sparkly crystal-adorned...