Yesterday, I explained why I don't buy the theory that most white voters are a bunch of racists.

But what about black voters? Do they automatically line up behind the black candidate?

Jacob Weisberg at Slate magazine has a provocative piece arguing that if Barack Obama loses the fall election, racism is the only factor that could explain the loss.

If you pay any attention to the news, you already know Sen. Obama has picked Sen. Joe Biden to be his vice presidential running mate.

I've always loved science fiction, so it got my attention when NASA astronaut Garrett Reisman -- describing his three-month trip to the International Space Station this summer -- talked about switching on his iPod to play "Blue Danu