Grassroots, as I understand it, is when the movement is not orchestrated, but just springs up around the politician. Ron Paul and Huckabee certainly qualify, but I don't see how Obama does.
Okay, Obama isn't grassroots. But he has still put together the single most powerful team of volunteers any election has seen. And he's orchestrated a lot of it over the Internet.
Government is a compromise between the benefits of collective action and the drawbacks of other people influencing those actions. We're not in the right place on the spectrum.
I support Obama because he has a reasonable approach to foreign policy, he cares about open government, he's ridiculously intelligent, his party isn't theocratic, and Sarah Palin isn't his running mate. I could do without the anti-trade sentiment, continuing the coupling of healthcare to employment, etc, but you work with the hand you've been dealt.
http://gawker.com/5042795/bloomberg-runs-steve-jobs-obituary
Compare the graphs here ( http://electoral-vote.com/evp2008/Pres/ec_graph-2008.html ), particularly the ones that leave out the "barely" states.
People are much less politically apathetic in the US than they were in 2000, and I'd bet money on a serious people-dying riot in the case of another shady election deal. The 2000 elections were close enough to fudge, this was a landslide.
I can't remember another time in my life where a lot of people were overcome with emotion to the point of tears at the result of an election in the US.