Social media was an important element of President Barack Obama's re-election campaign this past year, and it was driven in several cases by some extremely popular photographs. Now the White House has posted a photo album of some of the most memorable images taken of the President in 2012. Highlighting stunning work from the likes of White House photographer Pete Souza, the collection is not just a look at the highest office in the land — it's a testament to the stirring power of exceptional photography as well. We've included some standouts below, but be sure to check out the entire gallery for yourself. You won't be disappointed.