Well, let's look at it logically...and even willing to remove the "age factor" and say both men were in their 20s...

"foxhole" implies ground combat. Now, Obama grew up in a modest home and probably had his share of fights. He also spent time in the "rougher" parts of Chicago working as a community organizer.

McCain grew up priveleged, went to prep schools, and flew aircraft in combat...wasn't a "gropo" (ground pounder).

Yep....I'd go with Obama.