I'm probably reading too much into this but on Friday night, Obama included Clinton in his rationale for his campaign:
"I would not be here were it not for the fact that somebody, somewhere stood up for me. Because one person stood up, a few more stood up. Then a thousand stood up, and then a million stood up. That's why Hillary Clinton can run for President. That's why I can run for President."
And today, Clinton responded to chants from Obama supporters:
"If Senator Obama is the nominee, you better believe I’ll work my heart out for him."
Hmmm.