President Obama isn't just the first black president. He was the first sitting president to appear on late-night television, and has been a frequent guest on CBS' "Late Show with David Letterman."
Mr. Obama has clocked three appearances during his time in the White House, and appeared one last time Monday night, before Letterman retires May 20. He was also on the show five times while he was still the junior senator from Illinois before he became president.
Here are the highlights from some of the president's appearances on Letterman's show over the years.