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>> reporter: some residences you'll see in a minute. first, i want to show you the bayou in houston right off the interstate. usually a small creek. you can see what it looks like today. this is really what is fueling concerns of flooding, and off in the distance you're able to see a coast guard helicopter we've seen circling the area and hovering above this bayou for the last 15, 20 minutes or so. a little while ago lowering a cable with a hook and came right back attached to nothing. so we're not quite sure what kind of efforts are happening here but obviously these are the, the kind of air ...

52 years ago tuesday this was the scene in selma, alabama, as police turned on a peaceful crowd marching for voting rights. the day now known as bloody sunday. msnbc's tremane lee is in selma for the an verniversary. why does this year hold particular significance? >> reporter: every year since that year, 1965, there's been special significance here in selma. they kicked off the voting rights and i am here at brown chapel which really was the staging ground where much of the planning for the selma to montgomery march had been staged. you can see behind me, there are a couple hundred people tha...

Laws that need to be changed, they need to run it through the federal government. with attorney general jeff sessions, who supported the kind of overturning, gutting of section 5, many folks feel they're fighting the same fight that they fought 52 years ago, again. right behind me at brown chapel, much of the planning and preparations for that march from selma to montgomery happened right here. many of the early architects and foot soldiers who marched across the bridge that day, who were met by state troopers, who shed their blood fighting for voting rights, it all started right here. but aga...