Is there a brand partnership idea here?   The White House staff is talking about training the Obama family.  White House chef Sam Kass and personal trainer Cornell McClellan answered questions about working for the Obamas as they read to more than 100 children Wednesday at the Department of Education. Kass said he serves lots of vegetables including broccoli, spinach and whole grains. He said the family still has fun with a pizza or burger, but “we have very balanced meals.”   McClellan said the family does jumping jacks, push-ups, jump rope, boxing, soccer and basketball to keep fit.