How do i get the lincoln picture?

I was going to write directions, but mine felt confusing, so here http://fallout.wikia.com/wiki/Lincoln_Memorial_Poster. :vaultboy:

But don't go in there without talking to Hannibal, or you won't find the poster, just th eother stuff.

It might or might not appear aftre you talk to Leroy... never tried.

Caleb the stone cutter, at the Temple of the Union, makes it to appear as part of his quest, I believe.