Obama added a new zinger to his standard stump speech. 

It comes at around 1:05, but you need to listen to the set-up.

UPDATE: On the other hand, if Obama is going to go off-script, as he did in Raleigh today, he needs to bone up on his T.V. trivia:

Barack Obama, in Raleigh, N.C., was doing a riff attacking John McCain for supporting the idea of putting some mandatory retirement money into the stock market.

"If Senator McCain is elected, we'll have another president who wants to privatize part of your Social Security. Could you imagine if you had your Social Security invested in the stock market these last two weeks, these last two months? You wouldn't need Social Security. You'd be having a — like, what was it, Sanford and Son. `I'm coming Weezie!"

Memo to Sen. Obama:

Weezie was on The Jeffersons. Louise "Weezie" Jefferson — played by Isabel Sanford.

And it was Redd Foxx's Fred G. Sanford who used to feign heart attacks to guilt trip his son, Lamont:

"Oh, this is the big one! You hear that, Elizabeth?! I'm coming to join you, honey!"