This new study compares 2700 Turkers to the 1300 respondents to the CCES (the Cooperative Congressional Election Survey).
Some interesting findings:
*MTurk is relatively strong at attracting young Hispanic females and young Asian males and females.
*The number of respondents living in different geographic categories on the rural–urban continuum is almost identical in MTurk and CCES. Both MTurk and CCES draw approximately 90% of their respondents from urban areas.
The authors conclude that researchers can use these pools to over-sample and stratify to build samples that are balanced on theoretically motivated variables of interest.