Well, I hated this article save for this part...
"The image-conscious candidate and his aides prevailed upon reporters and photographers to let him have a first run down the mountain solo, except for two agents and Marvin Nicholson, his omnipresent right-hand man.
His next trip down, a reporter and a camera crew were allowed to follow along on skis — just in time to see Mr. Kerry taken out by one of the Secret Service men, who had inadvertently moved into his path, sending him into the snow.
When asked about the mishap a moment later, he said sharply, "I don't fall down," then used an expletive to describe the agent who "knocked me over."
From the NY Times, yuck, a Weary Kerry Gets Away From It All