Blumenthal warns: [T]he initial results of the exit poll interviews have had frequent problems with non-response bias, a consistent discrepancy favoring the Democrats that has appeared to some degree in every presidential election since 1988. Usually the bias is small, but in 2004 it was just big enough to convince millions of Americans who saw the leaked results on the Internet that John Kerry would defeat George W. Bush. It didn't work out that way. The resulting uproar led the networks, beginning in 2006, to hold back the data from their news media clients in a sealed quarantine room on...
