The reason politicians try to dress down is that they want to give off the impression that they can relate to the experiences of most Americans. The general idea being, "How could this person ever promote policy that benefits me, if they don't understand what it's like to be me?"
The irony is that most successful people in the world were rarely ever born with a silver spoon in their mouth. Kerry was actually one of those few candidates that I wished got their shot because his war record wasn't anything less but admirable. John Mccain's war record was far and beyond even his considering his many years being a POW.
They sacrificed so much for this country and yet the people only resonate with the candidates that seem hip nowadays.