Of course it was Mike Allen, the inveterate D.C. chronicler and media soothsayer, who broke the news this morning that Washington reporting power couple Peter Baker (The Times) and Susan Glasser (The New Yorker) were putting the finishing touches on a new Trump book, The Divider, out this fall. Baker and Glasser, of course, are among the most plugged-in people in town, and among those who possess the rare ability to both write for history while teasing the gossipy erogenous zones of many of the thirsty political creatures who populate the DMV. The book, Allen reported, is being touted as “an ambitious first cut at this historical moment.” But it may also be a bellwether on the salability of the Trump presidency in the more somnolent Biden era, one in which the 45th president still holds sway over his party but has proven ineffective at manipulating the anxieties of the mainstream media in his sweaty little palms.