This wouldn’t be such a problem if the second-best line of attack on Farage were not also out of bounds. Just one voter in three believes that Brexit was a good idea. No individual politician did more to bring it about than Farage. Were he to become prime minister, he would presumably maintain or harden Britain’s current relationship with the EU, which voters already regard as the pits. (Rejoining the customs union or the single market or the Union itself are all more popular than the status quo.)