It comes down to one word: authenticity. Sarah Palin is the real deal; there is no spinning or myth-making to do to present her story to the public, unlike the literally unbelievable "biographies" of Biden and Obama that are so insultingly served up. Sarah Palin, by contrast, has her feet on the ground, so to speak, and has the look of one who is completely comfortable in her skin.
This looks to me to be the real symbol of "girl power"; she has walked into committee rooms and faced powerful, connected, domineering Republican men, probably wearing shoes very much like these, and proceeded to kick butt and take names. And as Camille Paglia likes to remind us, symbols matter. Real women are cheering to see a real woman arrive at the Imperial City. She's going to take it to the Wizard in them shoes, just watch.