Abraham Washington wont "accept" that I brought him his declaration.
I have tried walking from Archive to rivet city instead of fast traveling.
Reloading game
pcb
CompleteAllobjectives
CompleteQuest
GetQuestCompleted

Non of these worked? Any help is appreciated.

And I gave him the Bill of Rights too..

This is nothing more than a memory bug. Can someone please kick this to technical issues? I've run into this problem on my machine as well..after rebooting and retrying the quest it went through normally..nothing more than a hex string glitched.

I tried that just now, it still wont register that I have it.

No offense Moderator, but you put it in the wrong location. Its supposed to be in Fallout 3 Tech issues, not FNV.