Oversampling? Trump making same wrong claim about polls that conservatives used in 2012

[pampango]

8. Donald Trump's favorite pollsters. A closer look at the three tracking polls Trump loves the most.

While the bulk of other polling shows Clinton building a significant advantage, the three polls reflect a vastly different race — one where Trump is frequently ahead. A joint project between the University of Southern California and the Los Angeles Times reports Trump is in the lead by a single percentage point. Rasmussen Reports, which had Trump leading by 2 points as recently as two weeks ago, now has Clinton 1 point ahead, 44 percent to 43 percent. The polling partnership between Investor’s Business Daily and the polling company Technometrica also finds a neck-and-neck race — the latest results released Wednesday put Clinton in the lead by 0.6 points.

The three polls are more obscure and, at the same time, more prolific than the major national surveys that dominate news coverage of the campaign and are often conducted by the nation’s most prominent news organizations. And their divergent results have put their unique methods under serious scrutiny.

http://www.politico.com/story/2016/10/donald-trump-tracking-polls-230293