Mike Allen’s Politico Playbook alerts us to this AP article about the end of David Letterman’s “Great Moments in Presidential Speeches.”

In case you’ve missed it, the bit contrasts clips of grand historical presidential rhetoric (“The only thing we have to fear…”; “Ask not…”) with clips from current presidential speeches in which George Bush is invariably fumbling for words, staring blankly, or putting his own special twist on the English language. You can watch a sample here.

“Great Moments” is usually pretty funny, even to a Bush fan. Still, I was surprised to learn that it’s run 378 times in the last three years. That’s some pretty good comedic mileage.

No doubt all the late night comics and comedy shows are a little bit sad, from a professional standpoint, to see President Bush go. And thank goodness Frank Caliendo has John Madden to fuel his fire.

The question now is, what will be funny about Barack Obama? Saturday Night Live seems to have found some traction with Fred Armisen’s cooler-than-cool impersonation of Obama. But I don’t expect that will have the same laugh-power as the images of a goofy fratboy Bush or an indefatigably lecherous Clinton (or a stony, impossibly power-hungry other Clinton).

The AP tells us that Letterman’s writers are hopeful Joe Biden will produce laughs a plenty. But can you build lasting Administration humor on the vice president?