From the Huffington Post:
President Barack Obama on Thursday tried to lay to rest the suggestion that his administration considered replacing Vice President Joe Biden with former Secretary of State Hillary Clinton on his 2012 reelection ticket.
"Here's the one thing I can say for certain," Obama said [to MSNBC's Chuck Todd]. "That, if they had asked me, I would have said there is no way that I'm not running again with Joe Biden. Because I genuinely believe that he has been one of the best vice presidents in our history. He also happens to be a friend. He also happens to be one of my most important advisers on domestic and foreign policy. I like him. When my back's up against the wall, he has my back."