The 2001 and 2005 models used by Clinton and Bush have been based on 2000-2005 DeVille and 2006-present DTS exterior styling, but placed on beefed up truck chassis and prob has 4WD. The last two models had gasser engines. The one that Obama or McCain will use (I'm not touching on who I think or who I want to use it) appears to be a mixture of STS and Escalade parts, and according to the leftlanenews.com guys, the exhaust note sounds like it has a diesel powerplant.

http://www.leftlanenews.com/cadillac-limo.html

BTW- Check out the trailer hitch, is that to haul barrels of WVO to the White House from nearby restaurants?

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.