Obama's experience in politics
How much experience in politics does it take to keep the whole of US media in the dark, regarding your VP candidate name, when every single news network is after this valuable piece of information?
How much experience does it take to pick the right people around you so that your most valuable secrets remain secret?
How much experience in politics does it take to keep the most experienced journalists and reporters where you want? To have journalists wondering, on-air, "how did he manage to do it?"
I really don't know. But Obama obviously has it.