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Researchers have increasingly turned to online convenience samples as sources of survey responses that are easy and inexpensive to collect. As reliance on these sources has grown, so too have concerns about the use of convenience samples in general and Amazon’s Mechanical Turk in particular. We distinguish between “external validity” and theoretical relevance, with the latter being the more important justification for any data collection strategy. We explore an alternative source of online convenience samples, the Lucid Fulcrum Exchange, and assess its suitability for online survey experimental research. Our point of departure is the 2012 study by Berinsky, Huber, and Lenz that compares Amazon’s Mechanical Turk to US national probability samples in terms of respondent characteristics and treatment effect estimates. We replicate these same analyses using a large sample of survey responses on the Lucid …