All it takes is one gaffe to taint a Republican for life. The political establishment never let Dan Quayle live down his fateful misspelling of “potatoe.” The New York Times distorted and misreported the first President Bush’s questions about new scanner technology at a grocers’ convention to brand him permanently as out of touch. But what about Barack Obama? The guy’s a perpetual gaffe machine. Let us count the ways, large and small, that his tongue has betrayed him throughout the campaign: Last May, he claimed that tornadoes in Kansas killed a whopping 10,000 people: “In case you missed it,...