Clinton is MSFT, Obama is Google
Clinton is an OS - request a feature and it will be considered, then prioritized for a four-year release cycle. Obama is an API - if you want something, build it.
Clinton is the familiar new IBM CEO, appointed by the Board of Directors because they all sit together on Pepsico's board. Obama is the start-up CEO - you'll quit your job to be employee #6 because you get to be part of the solution.
Clinton is a permission required mailing list. Obama is a wiki.