Rule one of electoral politics is never, ever insult the voters. One would have thought this was something every professional politician would know in their very bones.
Hillary Clinton infamously described tens of millions of American voters as a basket of deplorables. And she lost the election.
Tim Farron, the leader of the Liberal Democrats, responded to the result of the European Union referendum by calling the people who voted to leave ignorant, uneducated racists. And the electorate rejected him and threw him out at the next election.
Vince Cable inherited Mr Farron's position as Leader of the Liberal Democrats and apparently his complete opposition to democracy. Mr Cable has an extraordinary article in today's Mail on Sunday. He calls the people who voted to leave the European Union jihadists. He accuses them of attacking the young. He accuses them of McCarthyism. These insults are rich coming from Cable.
Mr Cable has actually supported the real jihadis. He was a minister of the British government which helped to overthrow Libya, turning Africa's most developed country into a haven for jihadist terrorists, some of whom came to this country to commit atrocities, specifically the Manchester bombing.
Mr Cable was elected to parliament on the promise of not charging tutition fees for university students. Yet as soon as he was in government, he voted for the charging of tutition fees. He was also a major promoter of austerity measures and zero hours contracts, and an opponent of the National Living Wage.
It is also rich of Mr Cable to accuse the leave voters of McCarthyism and instituting thought crime. This is a man who is fully signed up to the thought crime ideology that makes criticism of Islam a crime and criticism of immigration racism.
Mr Cable is a fully committed ideologue of neoliberal globalism. As such he thinks anyone who does not share his ideological commitments is deplorable, ignorant, uneducated, xenophobic, Islamophobic and all the rest and should just shut up. This is why, even with the example of Tim Farron a mere three months old, he can so easily forget the first rule of politics: never, ever insult the voters.