http://www.msnbc.msn.com/id/15610721/site/newsweek/

"Nov. 7, 2006 - Regardless of which party claims control of Congress, one thing’s for certain: this has been the most expensive midterm campaign in history.
According to the nonpartisan Center for Responsive Politics, the price tag for this year’s election will reach at least $2.8 billion—about a 20 percent increase over the 2002 election cycle, the last midterm campaign."

$2.8 Billion!!