Intelligence Riddle - It's a Joke

Barack Obama meets with the Queen of England. He asks her,
"Your Majesty, how do you run such an efficient government? Are
there any tips you can give to me?"
"Well," says the Queen, "the most important thing is to surround
yourself with intelligent people."
Obama frowns, then asked, "But how do I know the people around me
are really intelligent?"
The Queen takes a sip of tea. "Oh, that's easy, you just ask
them to answer an intelligent riddle." The Queen pushes a button
on her intercom. "Please send Tony Blair in here, would you?"
Tony Blair walks into the room and says, "Yes, my Queen?"
The Queen smiles and says, "Answer me this please, Tony ~ ~ ~
Your mother and father have a child. It is not your brother and
it is not your sister . . . Who is it?"
Without pausing for a moment, Tony Blair answers, "That would be
me."
"Yes! Very good," says the Queen.
Obama goes back home to ask Joe Biden, his vice presidential
choice the same question ~ ~ ~ "Joe, answer this for me. Your
mother and your father have a child. It's not your brother and
it's not your sister. Who is it?"
"I'm not sure," says Biden. "Let me get back to you on that
one." He goes to his advisors and asks every one, but none can
give him an answer. Finally, he ends up in the men's room and
recognizes Colin Powell's shoes in the next stall.
Biden asks Powell, "Colin, can you answer this for me? Your
mother and father have a child and it's not your brother or your
sister. Who is it?"
Colin Powell yells back, "That's easy ~ It's me. Biden smiles,
and says, "Thanks!" Then, he goes back to speak with Obama..
"Say, I did some research and I have the answer to that riddle.
It is Colin Powell!"
Obama gets up, stomps over to Biden, and angrily yells into his
face, "No!, you idiot! . . .
It's Tony Blair!"