The New York Times profiles Gov. Kathleen Sebelius today:

Having Ms. Sebelius alongside him would allow Mr. Obama to highlight a Middle American heritage. His mother and maternal grandmother were born in Kansas, and his grandfather grew up there. Ms. Sebelius endorsed him early, in January, and Mr. Obama has great affection for her. "I love Kathleen Sebelius," he gushed to reporters this summer.

Much like McCain choosing a pro-choice candidate, I think picking Sebelius would distract from the general campaign. Which is not to say it won't happen. The reality is that if Obama chooses a woman not named Hillary it would lead to the question: What does she have that Hillary doesn't? Of course there are many things someone like Sebelius has/doesn't have, but Hillary supporters, of which there are millions, would take it as a slight to say the least.