More physically demanding than Man-on-Dog

Is SuperPac Man on his mount:

The man fueling Rick Santorum’s presidential campaign is a Wyoming cowboy with a special interest in conservative cause who wears a tall, white hat and likes to call himself the “man atop the horse.”

That seems a somewhat cruel thing to call your catcher, but he does leave a lot of money on the dresser. Here he is, right behind Ricky as they both work up a frothy lather.