Leave it to the Internet. Now adays you can bet on just about anything, including: who will be the next US president, when the recession will hit and when mad cow disease will hit the US, and you don't have to head to the Vegas strip. From the comfort of your home, you can head to this site for a wide array of choice investments. Instead of placing actual bets, you purchase shares in the outcome you think is more likely to occur, and you can sell your share at any point and make money on your investment.
For those interested in the presidential candidates: currently, Obama comes at a price of $92.80 per share; but Hillary is a steal at $6.20 per share.