The Arizona senator will finally make his 13th appearance on Letterman’s show, three weeks after he appeared to have fallen from the graces of the late-night comedian. CBS announced on Sunday that Letterman would welcome the Arizona senator back to his program on Thursday, despite the fact that he was very upset and disappointed with McCain’s sudden dropout those weeks ago, and especially with his shaky excuse.

Although he was scheduled to appear in “The Late Show,” with host David Letterman being a well known supporter, the Republican presidential nominee dramatically announced that he will suspend his campaign to focus on the nation's financial crisis and bailed on his appearance: "Tomorrow morning, I will suspend my campaign and return to Washington after speaking at the Clinton Global Initiative. I have spoken to Senator Obama and informed him of my decision and have asked him to join me."

The night of the show, Letterman was obviously upset and he kept making jokes about McCain’s excuse, although he still managed to keep it together by calling him a hero and mixing-up the praises with bitter statements. But disappointment reached its highest level, making room for sheer fury, masked under a comedic monologue, when Letterman got a hold of a live transmission in the CBS Evening News studio, where the Republican candidate was being prepared for airing, while the makeup artist was putting on a coat of foundation on his face.

Turns out, David had all the rights to feel upset and lied to, as McCain was at that very moment just a few blocks away and not rushing back to D.C. in an attempt to rescue the exploding economy. “He doesn’t seem to be racing to the airport, does he? Hey, John, I got a question! You need a ride to the airport?” Letterman said, while grinding his teeth.

Letterman is not one to forgive and forget that easily, for his famous quarrels sometimes last for a very long time, like the one of 16 years’ duration with Oprah Winfrey and another with rival late-night host Jay Leno.

Senator McCain was a “Late Night” guest for 12 times over the years, and he even announced his presidential candidacy on program, which makes the matter so much more delicate. No presidential candidate should ever drop out of Letterman’s show at the last minute and especially when there’s no better excuse than the “economical crisis.”

McCain took one wrong step that he might regret, as Letterman is one of the nation’s most influential hosts and influence is what one would need when running for president. So he probably gave it another thought, as Letterman gave it another chance, so the two of them will finally reunite on Thursday, but chances are McCain will have some explaining to do, for Letterman will surely not let the matter of the bailing pass by so easy.