Some time ago Lew wrote:

"The president moves about like Caesar Augustus, with a vast, graded court of civil and military aides, doctors, secretaries, valets, hairdressers, makeup artists, bodyguards, drivers, baggage handlers, cooks, food tasters, Praetorian guards, snipers, centurions, bulletproof limos, a portable hospital, and an armored rostrum. And that's when he travels in the United States."

The blogosphere (via Reddit) picked up the graphical version: