Here are presidential race results from battlegrounds states polled by Mason-Dixon Polling and Research for MSNBC, Knight-Ridder and in Nevada, the Las Vegas Review Journal.
These polls were conducted by Mason-Dixon Polling & Research, Inc. of Washington, D.C. from September 13 through September 14, 2004. A total of 625 likely voters in each state were interviewed by telephone.
Those interviewed were selected by the random variation of the last four digits of telephone numbers. A cross-section of exchanges was utilized in order to ensure an accurate reflection of the state. Quotas were assigned to reflect voter turn-out by county.
The margin for error, according to standards customarily used by statisticians, is no more than plus or minus 4 percentage points. This means that there is a 95 percent probability that the "true" figure would fall within that range if the entire population were sampled. The margin for error is higher for any subgroup, such as a gender or regional grouping.