Reply #45: This may shed some light. It's about a different poll but done by AP-Yahoo! [View All]

It looks like first people are contacted by phone by Knowledge Networks but they vote over the net:

"The survey of 2,230 adults was conducted Nov. 2-12 by Knowledge Networks and had a margin of sampling error of plus or minus 2.1 percentage points. The survey included 1,049 Democrats, for whom the margin of sampling error was plus or minus 3 points, and 827 Republicans, for whom the margin of sampling error was plus or minus 3.4 points. Unlike most Internet polls, this one is nationally representative because people are first contacted using traditional telephone polling methods, and are then followed using online interviews. People selected for the study who do not already have Internet access are provided with Internet access for free."

http://news.yahoo.com/page/election-2008-political-pulse-11202007