Al Giordano, blogging at The Field, puts his finger on the two most interesting elements of the Obama campaign's September fundraising success. First, buried in campaign manager David Plouffe's video announcement of a record-breaking $150 million haul is this significant bit of math: With an average contribution of $86 that means that more than 1.7 million people donated last month. Plouffe reports that September brought 632,000 new donors. The interesting number to me is the remainder: more than one million people out of almost 2.5 million that had given earlier in the year gave again in September. I agree with Al: the more than one million people re-upping on their support for Obama is a mighty affirmation of the campaign's small donor...