molly greider is a paralegal who became an activist in response to michael brown's death in ferguson, she's in st. louis. and jessica pierce is a co- founder of a group called the black youth project. she is in san francisco. jessica pierce, why do you can march? >> hi, how are you doing? >> woodruff: why do you march? i march because this is literally our lives at stake right now. it is literally our blood that's being shed on these streets. every 28 hours, there's a black person killed by a police force in this country. there are more people getting shot and killed on the streets here than in any line of defense in any other country. so really, what i march for is my life and my right to live it. >> woodruff: molly greider, is this about race or is this about something broader than that? >> i think first and foremost it's about race. i think, beyond that, there are broader issues, but i think that the issue at the forefront is certainly race. >> woodruff: so why do you march? >> because i feel morally obligated to. the fact that i'm not black does not mean that i should sit at home