While last-minute talk show cancellations are nothing new, John McCain‘s absence this week is apparently something David Letterman won’t be getting past anytime soon.

On Wednesday night’s Late Show with David Letterman, the host spent a good portion of the evening reacting bitterly to the presidential candidate’s snub. (You can see that clip here.) McCain, believing he needed to suspend all campaigning to focus on the economy, called Letterman to explain the situation. But instead of heading directly to D.C. like he had claimed, the senator was found taping an interview with Katie Couric during Letterman’s show.

Although McCain’s camp later explained that they didn’t think an appearance on a comedy show would be appropriate, David continued to unleash his disappointment during Thursday’s taping. Coincidentally, one of the guests during last night’s program was Paris Hilton—a former McCain target. You can watch segments from Day Two after the jump.

Part 1

Part 2 with Paris Hilton (discussion about McCain comes at 9:40)