Here's a cool graphic of the presidential limousine. It's a Cadillac. When I was growing up, it was a Lincoln. Maybe they want to promote diversity of suppliers. The armor plating and bulletproof windows are exactly what you expect, but here's a weird little bit: bottles of the president's blood are stored onboard, in case he needs a transfusion. Now THAT'S being prepared.
(hat tip: Kos)