No matter the subject, for surveys to make sense, they have to be sampling the correct population. …
So, with Sunday’s NBC News/Marist University polls in Iowa and New Hampshire igniting a flood of news coverage highlighting Donald Trump’s “surge” (Politico) and “strong” showing (NBC and the New York Times), in these crucial early states, it’s worth examining who was actually interviewed. CONT.
Ken Goldstein (U. of San Francisco), Bloomberg Politics