Coruscation

The addition of Mr. Biden was interesting, for a number of reasons. Mr. Biden was able to draw on his credibility with blue-collar, labor union America and his roots in Scranton, Pa., to add balance to the photo op that the White House presented: two black guys, two white guys, sitting around a table.

The four drank out of beer mugs. Mr. Obama had a Bud Lite, Sergeant Crowley had Blue Moon, Professor Gates drank Sam Adams Light and Mr. Biden, who does not drink, had a Buckler nonalcoholic beer. (Mr. Biden put a lime slice in his beer. Sergeant Crowley, for his part, kept with Blue Moon tradition and had a slice of orange in his drink.)

Officer Crowley is said (Carney @Clusterstock) to be a fan of Blue Moon, the faux Belgian Wheat Ale that is actually made by Canada's Molson. According to the Boston Globe, Gates likes Red Stripe and Beck's.