I still think the fact that a significant portion of the voting age populating chooses not to vote indicates (or should indicate) to both parties that there is a large untapped number of people who could possibly be convinced to vote for their candidates if they addressed their concerns. Just as manufacturers and advertisers don't ignore the portion of the population which doesn't buy a particular product, but try to encourage them to buy it by addressing their concerns (PCs were a good example of that), I would think the parties would move the same way.
However, if you always hold your nose and choose one of the two major candidates, you will continue to be ignored.
Guin--re working for change I agree (and I do such work in a number of ways), but again we are not talking about change as much as national politics (and in this case I'm thinking specifically of presidential politics). It has been a long time since a candidate aroused my interest, let alone excited me, and I have been let down again and again by those who I thought might have been able to do some good/bring significant change. Face it, PACs and big money control, and they do the bidding of their masters, not the voters (and face it, Citizens United just made it worse). indeed, the voters are pretty much ignored and taken for granted in the lesser of two evils system. There are plenty of excuses why they can't do what they promised, but very little in the way of real change.
Sue--
In this regard, I think Nader's candidacy in 2000 was a wake-up call to the Democratic Party, which resulted in a reassessment of its mission and a policy platform much more well-differentiated from the GOP in 2004 and especially 2008. The apathy generated by the Gore campaign gave us the GW Bush presidency.
Oh sure, they hit a few of the talking point, but very few of the acting points. And they carry out the budding of their PAC donors. And so they push through tax cuts when we are funding more and more by debt, keep pointless military actions going, keep political prisoners and other civil rights violations, the list goes on and on. I honestly don't think the dems learned all that much or really changed.
By the way, what is red/green voting?