Matt Tapscott spends his free time on weekends trudging door to door in leafy Des Moines neighborhoods, clipboard in hand, trying to make the case that a little-known congressman from Ohio should be the next president of the United States. His candidate, Rep. Dennis Kucinich, the onetime mayor of Cleveland, is bunched near the back in a field of 10 candidates seeking the Democratic nomination. From Our Advertisers Hoping to break out, Kucinich tells voters he "represents the Democratic wing of the Democratic Party" and offers fundamental change, not tinkering at the edges. That hooked Tapscott. But another hopeful, former...