A key adviser to Senator Obama's campaign is recommending in a confidential paper that America keep between 60,000 and 80,000 troops in Iraq as of late 2010, a plan at odds with the public pledge of the Illinois senator to withdraw combat forces from Iraq within 16 months of taking office.

The paper, obtained by The New York Sun, was written by Colin Kahl for the center-left Center for a New American Security. In "Stay on Success: A Policy of Conditional Engagement," Mr. Kahl writes that through negotiations with the Iraqi government "the U.S. should aim to transition to a sustainable over-watch posture (of perhaps 60,000-80,000 forces) by the end of 2010 (although the specific timelines should be the byproduct of negotiations and conditions on the ground)."

As Barack Obama continues to criticize John McCain for saying he’s willing to keep a 100-year troop presence in Iraq, another Obama adviser has suggested U.S. forces could stay in Iraq longer than the Democratic candidate initially thought.

Adviser Colin Kahl wrote in a policy paper for the Center for a New American Security that the United States should transition to an “over-watch” force of between 60,000 and 80,000 troops by the end of 2010, according to an article Friday in the New York Sun.

That appears to be at odds with Obama’s public position of removing all combat brigades from the country within 16 months of taking office.