Why would he be concerned?

A)  He and his administration were the ones telling her to lie to the American people after the attacks in Benghazi.

B)  The American people indicated that they don’t particularly care about being lied to when they voted him back in.

Via the Weekly Standard (h/t Memeorandum):

In response to a question from reporter Major Garrett on whether the Obama administration’s mishandling of Benghazi raises “core questions of basic competency,” press secretary Jay Carney revealed that Barack Obama “is not particularly concerned” about whether Susan Rice misled the American people:

“What the president is worried about, Major, is what happened and why in Benghazi. He is not particularly concerned about whether the ambassador or I went out and talked about the fact that we believed extremists might have been responsible. And whether we named them as al Qaeda or not does not–no, it certainly doesn’t have any bearing on what happened and who was responsible as that investigation was continuing on Benghazi.”

Here’s the video…