57 percent of blacks say police do a poor job of using the right amount of force.
Nearly nine in 10 people say race relations have not improved.
The guard was initially called in early Monday morning.
Lesley McSpadden says justice calls for the Ferguson arrest of Darren Wilson.
Lawmakers are targeting police with new and old legislation in wake of riots in Ferguson.
The family described the shooting as the "brutal execution of an unarmed teenager."
Critics say a Pentagon program has become a threat to civil liberties.
Clay said it was time for a review of programs that supply military equipment to police.
"We need to demilitarize this situation," the Missouri senator said of Ferguson.
The ban restricts flights below 3,000 feet.
Differing tone could provide clues for the divergent trails the senators are forging.
Ferguson police chief says Brown was stopped for walking in the middle of the road.
Gov. Jay Nixon received criticism for waiting until Thursday to make a change in security.
The Missouri town has been rocked by the fatal shooting of a black teen by a police officer.