A Fist Bump From the Chief

President Obama has summoned world leaders to Washington this week for the Nuclear Security Summit. But at such events, he does more than just hobnob with bigwigs. Here's your proof: The photo below shows the president fist-bumping Lawrence Lipscomb, a custodian who works in federal offices under the AbilityOne program, which helps people who are blind or have other severe disabilities find employment with nonprofit organizations that sell products and services to the government:

The photo was taken on Dec. 3, 2009, during the White House Forum on Jobs and Economic Growth. It was taken by official White House photographer Pete Souza.