Richardson and Harman are my two early picks for potential VP running mates to whoever wins the Democratic presidential nomination.
Richardson is currently the governor of New Mexico – a significant swing state. He's also Latino and speaks fluent Spanish. Before being governor, Richardson served in the Clinton administration as Secretary of Energy and also as the permanent representative to the United Nations. Before that he was a member of Congress. Richardson helps any Democrat win New Mexico while strengthening them among the Latino community.
Harman is a congresswoman serving the Santa Monica region in California. She is the ranking member of the House Intelligence Committee so she has a strong resume in fighting terrorism. Harman helps secure California and secure the women's vote for a potential Democrat.
Both Richardson and Harman have not yet been talked about as a potential vice president but I expect we will start hearing both their names more often over the next few months.