You know the old software programmer's excuse: "that's not a bug. That's a feature!" John Harwood of CNBC/NYT came up with a political variation on the theme this morning to buff up Joe Biden. Biden's gaffes, including the racially-insensitive ones, are actually . . . "a strength." Harwood was chatting with Joe Scarborough and Mika Brzezinski on a special Morning Joe edition today, and the topic of Biden's famous "clean and articulate" comment about Obama arose. Biden also made headlines of course with his crack about 7-11s being populated by people with Indian accents. JOHN HARWOOD: He is not somebody...