What's harder?
Convincing enough people to matter (in some kind of election-based system) to get behind your platform - either with you as a candidate, or working to promote a candidate or party or movement that you do believe in.
People talk like their changemaking ideas are very widely held - the way people talk it's like they believe 75%+ of the country must actually agree with them - but then they don't run for office on such a popular platform that it should be a sure election win, yes even with countervailing forces such as electoral college, Senate, etc.