It's weird to say that America isn't interested in extremist candidates in a world where Donald Trump got elected. To me his rise showed that if anything Americans are sick of moderate, polished, focus tested candidates for better or worse. Most people aren't policy wonks and the election really is a popularity contest for a not insignificant portion of the electorate. I think these days people respond to candidates who seem more genuine and are focusing on big ideas (regardless of how realistic they actually are).