go long. . >>> u2 singer bono is known for his music and activism but lately he's been making headlines for a more light-hearted moment. >> fredericka, as you would expect bono is a larger lan life character with wide-ranging interests. we chatted about africa, foreign aid, innovation. but i have to share one thing that everyone has been talking about. you remember that he imitated bill clinton last week at the cg icon frens and then bill returned the favor. well, i asked him how that all came about. >> well, he was off doing some stuff. he lost his notes. and i -- sheryl sandberg actually, from facebook, said you have to do something. performers don't like lulls. i went up and pretended to be him. >> when i first met bono, he walked into the oval office and i -- actually i thought it was a member of his own road crew. >> what did you think of his