Obama and Cheney

Interesting piece in The Guardian today:

Now here's a thing. Did you know that Mareen Duvall, a great-great-great-great-great-great-great-great-great-great-grandfather of Democratic hopeful Barack Obama, was also a great-great-great-etc-grandfather of Republican veep Dick Cheney? Well, courtesy of some remarkable and important work by US genealogist William Addams Reitwiesner, we can now reveal that he was. Amazing, really.