Well, it definitely appears to be meat of some sort. U.S. Sen. John Cornyn of Texas on Thursday tweeted a photo of his family's holiday meal with the caption, "Brisket family tradition." As Cornyn is the senior senator from Texas, it's no surprise that the tweet set off a big reaction. Brisket's big business in this state, and the meat seen in Cornyn's photo looks a far cry from the kind you'd find in the pit at spots like Franklin and Snow's. For one thing, Cornyn's looks pretty dry. For another, the red stuff on the top — barbecue sauce,...