Banning Junk Food in Schools

Considering all the problems with childhood obesity, I've never understood how schools can peddle off junk food on their kids during the school day just to earn a buck. It's too bad common sense has to be government-mandated, but now Arizona appears to be doing something about changing that by passing a "junk food bill" that would ban soft drinks and candy sales during the school day. Several other states are considering similar bills.