Well, 0bama has really done it this time. He has broken Federal Law.
What is the Logan Act?
§ 953. Private correspondence with foreign governments.
Any citizen of the United States, wherever he may be, who, without authority of the United States, directly or indirectly commences or carries on any correspondence or intercourse with any foreign government or any officer or agent thereof, with intent to influence the measures or conduct of any foreign government or of any officer or agent thereof, in relation to any disputes or controversies with the United States, or to defeat the measures of the United States, shall be fined under this title or imprisoned not more than three years, or both.
This section shall not abridge the right of a citizen to apply himself, or his agent, to any foreign government, or the agents thereof, for redress of any injury which he may have sustained from such government or any of its agents or subjects.
1 Stat. 613, January 30, 1799, codified at 18 U.S.C. § 953 (2004).
Is there any other relevance to the Logan Act?
"[T]he President alone has the power to speak or listen as a representative of the nation. He makes treaties with the advice and consent of the Senate; but he alone negotiates. Into the field of negotiation the Senate cannot intrude, and Congress itself is powerless to invade it."
“The President is the constitutional representative of the United States with regard to foreign nations. He manages our concerns with foreign nations, and must necessarily be most competent to determine when, how, and upon what subjects negotiation may be urged with the greatest prospect of success. For his conduct, he is responsible to the Constitution.”
– In the majority opinion of Justice George Sutherland from United States v. Curtiss-Wright Export Corp. (1936)
According to this Barack Obama is guilty of violating the Logan Act by trying to delay troop withdrawal from Iraq.
And he should go to jail.