It's a memo from the Office of Legal Counsel to the Attorney General on justice.gov It references Clinton v. Jones, Nixon v. Fitzgerald, United States v. Nixon etc.
http://www.justice.gov/olc/sitting_president.htm
IMHO America made a huge mistake. One that would probably be impossible to undue without a constitutional crisis, martail law, etc. No one would have ever thought anyone would have the audacity to actually pull off what Obama and Pelosi and the democrat party pulled off. No one could have imagined this could happen. We weren’t ready for such blatant criminal behavior. We should be ready for anything the rats could try to pull off in the future. Our party needs to step up on this one. I can’t believe they are sitting on their hands. They should not be ignoring this. Boener needs to come forward.
It also discusses the problems that arise from the separation of powers issues.
A Sitting President's Amenability to Indictment and Criminal Prosecution
Tough!