25 : sea of people
One of many moments at which the importance of the March just washed over and overwhelmed me. We were turning the corner onto the north side of the Mall, and we could see the S-curve of marchers arcing around the next street.
Also, coincidentally, this is about where the first marchers started from, and near where a small group of anti-abortion folks had curled up and done a "die-in" - but I didn't realize that. It just looked to me like someone had drawn pretty little chalk clouds on the sidewalk.