Looks as if Rafsanjani's pollsters are worried about his popularity among the youth. Take a look at the pictures that were recently taken at this meeting with some young Iranian boys and girls and you'll know why.
Iranian officials usually avoid appearing with young boys and girls who favor a more Westernized look over the semi-official look that is for instance preferred by TV anchors. (Men should not wear jeans and short sleeves and women should completely cover their hair and wear a "chador":http://www.answers.com/chador .)
The pictures were taken by Fars News which is not quite friendly toward Rafsanjani and seems to be supporting Larijani.