Fallout 3/Head of State

Head of State is a quest concerning the Lincoln Memorial, which is occupied by Slavers.

When you approach the building, a slaver will mention that you should stay off the steps, as the slavers will shoot anyone on sight. In addition, the area around the memorial contains traps; the only safe location is a path to the maintenance door on the left.

Leroy Walker
Leroy Walker has two tasks for you. The first is to retrieve an artifact from the Museum of History. The artifact will be marked on your Pip-Boy, and is on the upper floor of the Museum of History Offices, in the same room as the turret. One artifact is a sound recording of Lincoln's Voice. Return to Leroy Walker to receive a 50 cap reward, and permission to enter the memorial.

The other task involves looking for a few runaway slaves to the north, near Old Olney. He will give you about 100 caps for recovering the slaves (but not killing them.)

Temple of the Union
The Temple of the Union is a group of runaway slaves, located Northwest of Canterbury Commons. They will let you in when you ring the doorbell and say that you are here for trading. When you reach Hannibal Hamlin, you can talk to him and learn that he is the group of escaped slaves trying to avoid capture from the slavers.

He has two tasks for you. The first is to clear the Lincoln memorial of Super Mutants (although they're already dead, in this case, you remove the slavers instead.) The second is to help Caleb find a picture of the memorial building, also within the Museum of History. As with the voice, it is found within the same room as the turret, and is hung on a wall.

When you have the picture, return to Caleb and give it to him. You can also sell Lincoln's Voice to Hannibal for 50 caps as well.

Artifacts
The artifacts within the Museum of History can be sold to three people. You can either sell them to Leroy Walker, Hannibal Hamlin, or Abraham Washington from Rivet City.