The prediction calculations use accepted statistical techniques combined with highly optimized algorithms, which in turn invoke special functions from mathematical physics (think Gauss, Chebyshev, and the incomplete gamma function for all you applied mathematicians out there). All of this is a nice way of saying that the results are accurate and that things run fast, very fast, but don't let that fool you -- there's a lot going on beneath the covers.

From the following list of polls for each state, choose as many as you would like to combine. You can get results for multiple states on each run and, within a state, you can use only the polls you wish to include in the calculations. Also, it is important to remember that each state is run independently of the other states, so that if you want to make a prediction for any state you can run with just polls from just that state or along with polls for other states.

One final note: Sometimes the sample size for a survey is unknown. In such cases a default, small size is assumed for calculational purposes and this is noted.