Yesterday, Obama gave the Kansas governor high praise on a Missouri Fox affiliate, going so far as to hint that she could be his vice presidential nominee:
I love Kathleen Sebelius. I think she is as talented a public official as there is right now. Integrity. Competence. She can work with all people of all walks of life, but I promised that I am not going to say anything about my vice president until I actually introduce my vice president.
The Huffington Post's Sam Stein profiled Sebelius in June and concluded that she "presents a heap of electoral promise but with small but significant question marks."
Read The Huffington Post's rundown of potential Obama VP candidates here.