`` I screwed up , '' John McCain tells David Letterman for canceling scheduled visit . McCain 's appearance on the show comes three weeks after he raised the ire of the generally mild-mannered host by canceling at the last minute , citing his decision to suspend his presidential campaign because of the financial crisis . Letterman used McCain 's no-show as subject of ongoing joke . Comment:
`` I screwed up , '' John McCain tells David Letterman for canceling scheduled visit . Letterman used McCain 's no-show as subject of ongoing joke . Comment: