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There has been plenty of speculation about which Republicans will enter the race to challenge President Obama in the 2012 presidential elections.

But on MSNBC’s “Morning Joe” yesterday, Democratic Pennsylvania Governor Ed Rendell threw a curveball into the discussion when he suggested that Mr. Obama could face a challenge from within his own party if he were to escalate U.S. involvement in Afghanistan.

While the governor didn’t point to any specific potential primary challengers, he implied that Mr. Obama would need to keep his word on beginning to withdraw troops from Afghanistan in July 2011 to avoid a challenge from the left.