NPR

Presidential Double Take: The Difference Four Years Makes

President Obama seems to have picked up a few gray hairs in the four years since he was sworn in on Jan. 20, 2009 (left). On the right, he's shown in December 2012. (NPR)

Every president gets sworn in once, but it's a smaller club of presidents who manage to get there twice. Here's a look at some recent presidents who served two terms. See who changed the most (or the least) in four years.

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