Working in an electronics lab we always have to be cognizant of our electronic probes and how much their internal impedance affects the accuracy of the measurement.
Exactly my point when I stated they devise measurement methods that reduce the influence on the measurements.
In the lab, an engineer will go to great lengths, and expense, to obtain the results within the uncertainties his design can tolerate. On the layman’s level, we could compare measuring the tire pressure of your car’s tires. You make a measurement with a tire pressure gauge that has an inherent accuracy. However, that little pssst…you hear, as air escapes when you remove the gauge from the Schrader value means the true pressure is again unknown to you. This error is tolerable for a car’s tire pressure. Food for thought…there is a difference between accuracy and precision.
The effort to oppose Sarah Palin will go to no such lengths to assure accuracy. She will be on her own and we will observe how well she handles it.