Whatever one thinks of the President's actions so far, it does not seem likely that there will be a majority in Congress in the near future to force the withdrawal of U.S. military forces. But there might well be a majority in the near future to insist that a military campaign that goes on for months needs explicit Congressional authorization.
Forty years ago today, President Nixon addressed the nation to announce he would be resigning the next day -- the only time in US history this has happened. Today, President Obama announced the US will be dropping bombs on Iraq once again. That's a pretty heavy-duty amount of the past to contemplate, in one week.