Sure, but in the case of presidential elections you have both Man A and Man B walking into a bar and telling different jokes, with roughly half the people laughing at each joke.

Why did some people laugh at Man A's joke more? Was it an objectively better joke? Was it the delivery? Did they already know Man A from before, and thus were more likely do laugh at his jokes?

We're talking marginal degrees of charisma here, not giant leaps. Hence the debate in this thread.