Republican Sen. John Cornyn of Texas likes to present himself as a deficit hawk—a red-state conservative who “believes that Congress must be a good steward of the taxpayers’ money,” as his official website declares, and that “fiscal responsibility is the cornerstone for good governance.” So the revelation in the National Journal that the 61-year-old Cornyn is collecting three different state-government pensions while receiving his federal salary as a senator (a total of $239,383 in taxpayer-funded largesse) is slightly off-message, and just a tad inconvenient, as he gets ready to run for a third term next year. “There’s a lot of...