Apparently, a lot of people consider President Barack Obama to be bumblingly inarticulate. "The guy can't talk his way out of a paper bag!" a reader wrote to me recently. "Sarah Palin is a brilliant speaker. It's the president whose sentences are undiagrammable," said another in response to a column I wrote about Palin. It's not just my readers, nor is it exclusively conservatives, who hold this view. A Google search of "does Obama have a speech impediment" turns up several pages of discussion among the president's supporters and critics alike. Admittedly, the president is given to a lot of...