http://www.nytimes.com/2008/08/24/us/politics/24biden.html?_r=1&scp=2&sq=joe%20biden&st=cse&oref=slogin

This is a good article for those who do not know too much about Senator Obama's running mate. It also gives a look into why Obama chose Biden. The article also discusses how the news broke and how the Obama campaign chose to leak the information to the media.