"The last four U.S. Presidents and the Wizard Of Oz" joke

The last four U.S. Presidents are caught in a tornado, and off they spin to OZ. After threatening trials and tribulations, they finally make it to the Emerald City and come before the Great Wizard.
"WHAT BRINGS YOU BEFORE THE GREAT WIZARD OF OZ? WHAT DO YOU WANT?"
Jimmy Carter steps forward timidly: "I had a terrible time with Iran, so I've come for some courage."
"NO PROBLEM" says the Wizard, "WHO IS NEXT?"
Ronald Reagan steps forward, "Well..., Well..., Well..., I need a brain."
"DONE" says the Wizard. "WHO COMES NEXT BEFORE THE GREAT WIZARD?"
Up steps George Bush sadly; "I'm told by the American people that I need a heart."
"I'VE HEARD IT'S TRUE," says the Wizard. "CONSIDER IT DONE."
Then there is a great silence. Bill Clinton is just standing there, looking around, not saying a word.
Irritated, the Wizard finally asks, "WELL, WHAT BRINGS YOU TO THE EMERALD CITY?"
"Is Dorothy around?"
Dorothy: "How can you talk if you haven't got a brain?"
Scarecrow: "I don't know. But some people without brains do an awful lot of talking, don't they?"