Looks as though this is strictly a photo op. His long hurried strides are making her practically run down the street and there’s no treat bag in sight. It’s not nice to use your children as props...
She has no bag because they’re on their way to a party according to news source.
Compare the genuine photos of Sarah Palin and her children where you see real warmth and parental love. Obama is the coldest, most ruthless calculating politician I've seen in a while. I'm sure that's his persona at home, too.