Gambling is at least a $3 billion industry in Minnesota -- a conservative estimate because it doesn't fully capture sales at the state's tribal casinos. Here's the breakdown:

Tribal casinos: $1.5 billion in 2008, according to an estimate from Dr. Alan Meister's Indian Gaming Report. The revenue figure is revenue remaining after prizes but before expenses are paid. Tribes are not required to report revenues. The 11 tribes in Minnesota operate 18 casinos, according to the Minnesota Indian Gaming Association, which claims an economic impact of tribal casinos in Minnesota of $2.75 billion.

Horse racing $55.1 million

Card gaming $40.6 million

Venues: Canterbury Park Holding Corp. in Shakopee and Running Aces Harness Park in Anoka County both offer live and simulcast horse racing and a card room. Figures are from the Minnesota Racing Commission.

Minnesota State Lottery: $499 million

The Minnesota State Lottery reported record ticket sales for the year ended June of 2010, including $338.1 million from scratch games and $160.9 from lotto game. The lottery generated $122.2 million for state projects and programs. Minnesota has more than 3,000 lottery retailers.

Charitable gambling: $980 million

There are 1,292 nonprofit organizations licensed to conduct gambling, according to the Minnesota Gambling Control Board. Net receipts (gross less prizes) from gambling activities has fallen for nine of the last 10 years. Net receipts for the year ended June 30, 2010, was $179.7 million, down 5 percent from fiscal 2009.