Looking Back to Look Forward: Political Identity SEATTLE (KPLU) - In the McCain/Obama race no matter who is elected - a barrier will be broken. And because we're hearing so much about barrier breaking these days, it's easy to forget how seldom that's happened in our presidential history. Today we'll take a look at those who have challenged our notions of who can be president --- and how they did it. In part four of our series Looking Back to Look Forward, KPLU's Chana Joffe-Walt has our story. © Copyright 2009, KPLU