NEW YORK — President Barack Obama continued his busy promotional schedule Monday by paying a visit to the "Late Show with David Letterman."

During his appearance, Obama discussed a number of topics, including the recent controversial comment by former president Jimmy Carter, who suggested that criticism of Obama's presidency is driven by race.

"I think it's important to realize that I was actually black before the election," he told Letterman.

"How long have you been a black man?" the host joked in response.

Obama's visit marked the first-ever appearance for a sitting president on the CBS late-night show.

Watch video of Barack Obama on the "Late Show with David Letterman."