The right thing for the Feds to do is to stay inside the 10 square miles of D.C., and within the territories. Yes, if lands have been ceded by a State, they can occupy those lands as well.

In all other cases, the Federal Government should have an embassy on land adjoining the State capital of every State. If they want to do anything in the State, outside of the embassy, they must receive written permission from State legal authorities authorized to give them permission.

If they are bringing a case against any human being residing inside a State, the Feds must go through the State court system same as anyone else attempting to "sue" someone in a State.

Sorry, but it's too early to pontificate one way or the other about Obama. One thing for sure, there's a massive coverup of his past run right out of the White House. As to his birthplace, maybe Obama himself doesn't know, but now that he's been sworn in twice he can probably cite the grandfather clause no matter what is dug up.  If you really want to learn about Obama's shady past with all the complexity, there's only one place, my Obamascope, totally free, except for the time and mental work required to sponge it.  http://tinyurl.com/obamascope