Our National Debt/Can you afford it?

The Outstanding Public Debt as of 02 Sep 2007 is:

 

 

8,994,018,044,112

The estimated population of the United States is 302,878,206
so each citizen's share of this debt is $29,695.14.

The National Debt has continued to increase an average of
$1.44 billion per day since September 29, 2006!

Why have we not heard the presidential candidates talk  about this issue??