Instrument effects in public opinion polling. See
this piece in today's "Week in Review" section in the New York Times. Are people in favor of health reform? Turns out that government administered programs are different from government sponsored programs and especially different from government run programs.
Week in Review
Opinion Polling: A Question of What to Ask
By DALIA SUSSMAN
Opinions in polls about health care seem to differ. But it’s the polls themselves that differ.
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