It was on
betsy's page
It was this comment I believe.
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One of the highest WPE rates came in the data collected by those interviewers with post-graduate degrees. This is a group that leans to the left on average. (According to Gallup, Bush won among those with college degrees and among those with some college, but lost among those with high school diplomas or less and among those with post graduate degrees; the most highly-educated tend to be Democrats, but the average Republican is more educated than the average Democrat.) Many interviewers got the job through recommendations from their college professors (speaking of left-leaning demographic groups); others found the job via listings on craigslist.com, a site heavily frequented by urban hipsters. Even assuming there was no deliberate fudging of the numbers going on -- something I'm perfectly willing to assume -- there's little doubt that many of these interviewers had a demeanor that absolutely screamed liberal. Small wonder that Kerry voters would be more likely to talk to them.