Okay, so it’s not an official endorsement, but it’s damn close. 

From the National Journal’s Hotline: 

“Hillary Clinton told reporters that both she and the presumptive Republican nominee John McCain offer the experience to be ready to tackle any crisis facing the country under their watch, but Barack Obama simply offers more rhetoric. ‘I think you’ll be able to imagine many things Senator McCain will be able to say,’ she said. ‘He’s never been the president, but he will put forth his lifetime of experience. I will put forth my lifetime of experience. Senator Obama will put forth a speech he made in 2002.'”