Maryland-based Research 2000 conducted the random telephone poll of 800 likely Missouri voters from Sept. 15-18 for the Post-Dispatch and KMOV-TV (Channel 4). The demographics of those polled generally mirror Missouri's population; quotas were assigned to reflect the voter registration by county. The margin of error is 3.5 percentage points, which means that any figure could be that much higher or lower. The margin of error is larger for subgroups.