Conversation so far:
How did the 2008 elections effect him?
Silver's final 2008 presidential election forecast accurately predicted the winner of 49 of the 50 states.
Who did he predict would win?
Obama is going to win.
How did he make his predictions?
CANNOTANSWER.
Are there any other interesting aspects about this article?
Barack Obama's 2008 presidential campaign signed off on a proposal to share all of its private polling with Silver.

Question: What kind of things did they share?
Self-contained rewrite: What kind of things did Barack Obama share with Nate?