You could try here, at forbes.com:

Kerry Would Be Third-Richest U.S. President
Dan Ackman, 02.13.04, 7:00 AM ET

The Richest US Presidents

If you wish to know more about the selling of the presidency in 2004, try the Center for Public Integrity's very interesting website, which is touting the book "The Buying of the Pesident 2004" by Charles Lewis (one of their own) here:

Center for Public Integrity

Are those sources credible enough for you Don, or do you need more "proof"?