As usual, Charlie Brooker sums it up best:

During the London mayoral election, I had two main fears. The first, obviously, was that Boris was going to win. For weeks I repeatedly voiced that fear to everyone I met – to no avail as it turned out. But the second fear, the one I kept tucked away somewhere near the back of my head, was far more sinister. It was this: what if Boris won – and then turned out to be really good at his job? That might force me to question my cherished anti-Tory prejudice, which is so ingrained and instinctive it feels like something hand-stamped on my DNA.