A certainty "in these uncertain times"

Why is it that the media, while endorsing a politician, and more specifically, the candidates themselves, all have staked claim that they are the best person to lead us "in these uncertain times?" Are any times ever certain? Was there ever an election year where everyone was confident in where the markets were going, the condition of the environment, political stability in foreign nations etc.? To make claims that these times are more uncertain than any other is incorrect. I am no oracle, but one thing is certain, every four years around election time, we will be inundated with claims that these times are more uncertain those prior.