we are NOT leaving Iraq - why?

New report:

A January 31 report from the Senate Committee on Foreign Relations, for instance, estimated that the State Department will spend $25-$30 billion in Iraq over the next five years. The panel said that U.S. diplomatic operations in Iraq in fiscal year 2012 will spike to at least $3 billion, roughly a quarter of the State Department's global operations budget. Other State initiatives here--like the large and growing Office of Security Cooperation--will push the fiscal 2012 numbers even higher.

so one more time, why are we in Iraq?  Oil?  we are spending far more than we will ever get from oil.  Geo political influence?  what influence? Iran dominates Iraqi politics.  Does our presence help the Israeli -Palestinian conflict? No, its worse.  Looks like Israel is intent on keeping west bank.  so again: what are we doing there?  Even at the height of the British Empire, the height of european colonialism, at least those countries got something from their colonies.  what are we getting from Iraq? 

Obama cant get out, or wont.  who is keeping us there?  what is Obama facing?  some kinda cabal of industrial-military contractors, sunk cost military-diplomatic thinking that we just cant leave?