"The Great Wizard of Oz" joke

The last four ex-U.S. Presidents were caught in a tornado, and off
they whirled to Oz. They finally made it to the Emerald City and came
before the Great Wizard.
"What brings you before the Great Wizard of Oz?"
Jimmy Carter stepped forward timidly, "I've come for some courage."
"No problem!" said the Wizard. "Who is next?"
Ronald Reagan stepped forward, "Well... I... I think I need a brain."
"Done," said the Wizard. "Who comes next before the Great and Powerful
Oz?"
Up stepped George Bush sadly, "I'm told by the American people that I
need a heart."
"I've heard it's true!" said the Wizard. "Consider it done."
There was a great silence in the hall. Bill Clinton was just standing
there, looking around, but didn't say a word.
Irritated, the Wizard finally asked, "What do you want?"
"Is Dorothy here?"