In 2007 Why did Barack Obama say he went to Kenya?

During a 2007 [Dem} debate where Biden discusses black men should be tested for aids, and he states barack was tested.

Barry responded that he and Michael (sp?) were tested before their trip to Kenya.

Guess he wanted to show where he was born and pickup some paperwork.

ALL-AMERICAN PRESIDENTIAL FORUMS | Sen. Joe Biden | PBS

https://www.youtube.com/watch?v=YZzWYCxjdnY