Here's a link to the Center for Responsive Politics page detailing total spending on the 2010 midterm elections.
Their history page puts this year's spending in perspective.
In case you are wondering what that money is spent on, read this: Call it the midterm stimulus program. The record-breaking campaign showered billions of dollars on a broad array of companies, including broadcast conglomerates, polling firms and small-town restaurants, according to a Washington Post analysis of expenditure reports. Candidates spent at least $50 million on catering and liquor, $3.2 million at country clubs and golf courses, and $500,000 on pizza, coffee and doughnuts, the records show.
