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I know I've been quick to draw comparisons between the Sanders campaign and the Paul campaign of '08. Paul had the grassroots support, he had the young people, he had the libertarian fringe of the R party worked up into a frenzy just like Sanders is doing (except on the fringe of the D party). So the cynical part of me says we will see a similar result.
There are differences, though. Sanders is one of what, three announced D candidates? Paul was caught up as one of nearly a dozen R candidates if I recall correctly. Sanders is coming from the progressive side both socially and economically, which (in my estimation) could lead to a bigger draw than Paul's socially liberal but economically conservative stances. As difficult as change can be on a national scale, I think it's quite a bit easier to move things forward than backward.
Regardless, I look forward to seeing Bernie's ideas get more attention in public forums.