(Bloomberg) -- Boris Johnson was humiliated by Parliament for a second day running, with his do-or-die Brexit strategy derailed and even his plan for a general election rejected. But having bet everything on getting Britain out of the European Union by Oct. 31, he can’t back down. The U.K. prime minister has lost all authority in the House of Commons and must find a way to win its support for an election so he can get a shot at commanding a majority. If he can’t, he will be trapped in office, compelled by law to request a further delay to Brexit.Johnson is the third Conservative leader to be undermined by the intractable task of delivering Brexit more than three years after the fateful 2016 referendum. Unlike his two predecessors, though, he was a key architect in persuading the British public to vote for it. That decision was meant to settle the European question in British politics that had been lurking for decades. Instead, it’s torn the Tories apart and left a nation that was once ...