An eye-popping new poll shows Elizabeth Warren vaulting to an 11 point lead in Iowa — hitting 28 percent support, while Joe Biden and Bernie Sanders have dropped back, tied for second at 17 percent. 

What do you make of this Iowa poll? pic.twitter.com/dk4B5su0CR

— Tim Dickinson (@7im) August 15, 2019

But something seems off about the Iowa survey, which comes from a pollster called Change Research. The outfit conducts surveys online, has a middling reputation, and isn’t included, for example, in Real Clear Politics’ average of polls. The company’s description of its methodology, moreover, doesn’t inspire confidence:

The survey was conducted online, using Change Research’s Bias Correct Engine. Change Research reaches collects [sic] survey responses through targeted online solicitations placed as

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