Another reason why the march was successful in terms of numbers — it’s easier to protest when you are the opposition to those in power. You show up and walk and chant and then go home and back to you “real” life. Elections and campaigns take a great deal more work — you knock on doors, talk with people (potentially people who disagree with you), create messages that have to carry for longer than a march, raise money, and do that and more each day, every day. It’s tiring. Most people don’t have the energy or desire — especially when the candidate is mediocre. But a march, it’s a fun one-day event. People who march and protest get to say they did something. I don’t care what protest or ideological bent the protest comes from, the same idea applies.