An Obama/Richardson ticket?

If Barack Obama manages to become the Democratic presidential candidate, who will be his vice-presidential running mate? Hillary Clinton seems unlikely, and I don't think it would be a good combination in any case. John Edwards has stated that he has no intention of being a vice-presidential candidate again.

How about Bill Richardson? He offers complementary experience, as a governor, to Obama's legislative background. I believe that Richardson demonstrated in the campaign that he could be a good president if something happens to Obama. He comes from a different region of the country, and his Mexican roots will help the ticket with Hispanic voters. This could work...