Actually, I think that the internet forums are having quite a bit of impact on trends. The MSM frequently follows leads and repeats analyses that were first developed by regular folks on various internet forums. Some of those forums have more influence than others. Piggs have been quoted in the SD Tribune and the LA Times, with and without attribution, on a number of occasions. Even the Wall Street Journal and the NY Times have picked up a byline or two that was originally developed here.
I daresay a Joe Average citizen who can research, analyze and communicate their opinions in a cogent manner can exert far more influence by participating in a reasonably moderated internet forum than they can by writing 200 letters to politicians who won’t do anything that isn’t supported by poll numbers.
This is something the DC crowd has been learning the hard way.