Nice pictures.
The not having a float or riding in a car says a lot. I'll try and emphasize the good.
1.) With gas as high as it is, it would have been expensive to ride anything more than a scooter around, which would show a fiscal irresponsibility.
2.) Walking the entire parade length shows that you are at least in good enough shape to walk the entire length.

3.) Allows to get to meet the people, shake their hands, and get photo ops. All things any candidate should do.