"And the Labour Party actually got behind the campaign."
In politics, sooner or later if your successful enough people come round.
Elected despite the Parliamentary Labor Party hating him.
Bought a huge number of people into the party because the liked him, not the party. PLP hate him.
Leadership challenges. Failed. PLP hate him.
Election. Tories expect to annihilate Labor for a generation. PLP thinks so to. End up with hung parliament. PLP hate him.
Perhaps the PLP might like to re-consider there views? It may seem that to win big you need an authoritarian control freak and possible undiagnosed psychopath but maybe, just maybe someone whose a bit more neurotypical might be the way to go.