while visiting oklahoma city , bill clinton said ` i 'm proud of her ' , in reference to hillary clinton 's presidential bid .
this is the first comment he 's made about his wife 's campaign .
bill clinton was in oklahoma city to mark the 20th anniversary of the bombing that 168 people including 19 toddlers in federal building .
hillary clinton kicked off her campaign in iowa last week and will move on to new hampshire on monday .