Allow me to introduce myself. According to the general clucking of the national punditry, my 2004 book – "What's the Matter With Kansas?" – is supposed to have persuaded Barack Obama to describe the yeomanry of Pennsylvania as "bitter" people who "cling to guns or religion or . . . anti-trade sentiment as a way to explain their frustrations." Mr. Obama's offense is so grave that the custodians of our national consensus have elevated it to gatehood: "Bittergate."

In truth, I have no way of knowing whether some passage...