For a poll to be accurate it has to follow one basic principle - every person in the population being measured must have an identical chance of being contacted.
Any poll which is self selecting (ie you choose or not to participate) is junk.
If you go to
www.HateGeorgeBush.com and look at the online poll I suspect Mr. Kerry is doing well.
If you go to
www.TaxCutsAreGood.com I suspect Mr. Bush is doing ok.
Gallup, Harris Online and Zogby are both doing some work on trying to get usable online internet polls, and I suspect in a few years they will have things sorted out.
But right now anything internet based has to be regarded as, at very best, experimental.
