In the early days of the annual march for life there were no bishops at all, and few priests. The organizers were lay people.
As I'm sure you know, a black woman was the earliest leader, and there were at least some non-Catholics involved, though relatively few. The priests and bishops started to get on board when it became evident that this thing was not going to go away. First a few pro-life priests, then a few pro-life bishops, then maybe a few embarrassed bishops who couldn't afford to get left out. That last is conjecture.
Thank you for posting this and pinging me to it! Congratulations to you and your kids. It is an incredible experience. We had a little march here in St. Augustine (our first one; before we just had a rather quiet vigil) and we got about 300 people. That's pretty impressive for a small place like this. Most of the passersby, including our many tourists, were either positive or, if opposed, weren't too gross about it. No spitting, punching or shrieking, as happened on pro-life marches when I lived in NYC!
I bet the kids were thrilled and I am sure they will be coming back next year too. I think I will try to find a bus from Florida to come up with, as well. Or maybe Roe v Wade will be overturned by then? Miracles do happen - although I'm not sure there's a case on the horizon at the moment. But I sure hope Bush gets at least one more appointment, and that might make it possible.