And he could answer to devastating effect:
1. Uhm no, the only reason the Conservatives won the last two elections was that the vast majority of voters did not want Corbyn to be PM. For the good of the Labour Party and the country we were justified in trying to replace him. It is a tragedy for our party and our country that we did not succeed.
2. Umh no, most political analysts believe no such thing. They believe that the overwhelming cause of our defeat was Corbyn and not our Brexit policy.
Recent opinion polls have shown that Labour's historically bad election loss was caused by Corbyn's very deep unpopularity and not by Brexit.