Only asking if he can really make it without resorting to the large donors. Obama did an incredible job, doing fundraising from a wide base (lower average donations), but still had to court the larger donations to make it through the primaries. Can Bernie really do it with <$50 average per person donations?
I don't disagree with the grass-roots popularity, but you need money to run a serious shot. He raised 1.45 million the other day, it was great, but that is simply not enough. If he did that sort of fundraising EVERYDAY it might be possible, but the same people that are giving 50$ can't keep giving. The base of doners would have to be huge, much bigger than Obamas first run.