The other Senators' replies can be read here.

Transcript
UNITED STATES SENATE
May 8, 2003
Mr. John Hargrave
PO Box 57013
Babson Park, MA 02457-0012
Dear John:
Thank you for contacting my office to request a joke for your project. I am happy to oblige.
Here is my favorite joke: I feel terrible for all the mothers in the state of Arizona. Because, as you know, Barry Goldwater from Arizona ran for President of the United States, Morris Udall from Arizona ran for President of the United States, Bruce Babbitt from Arizona ran for President of the United States, and I, John McCain from Arizona ran for President of the United States…Arizona may be the only state in the nation where mothers no longer tell their children that some day they can grow up and be President of the United States.
It was a pleasure to hear from you. If you would like information regarding my interests and history as a Senator, please refer to my website: mccain.senate.gov.
Please do not hesitate to contact me in the future.
Sincerely,
(Signed)
John McCain
United States Senator
JM/amj