To the depth that would satisfy a House impeachment committee! Because while everything else is interesting, and may well be true, it carries no punch.
Now, where would that hard evidence come from? We could either prove that Obama was not born in the US, or we could prove that he is acting essentially as a foreign agent. IMHO, it would be easier to find proof that he was not born in the US, and I'm betting that's what's on his college records.
I guess a lot of what I'm saying here comes out of frustration. I want that CIA officer, and Sheriff Joe, to come up with proof. I know it must be out there...I'm just waiting for someone to deliver it.