Misinformation about events surrounding the 2020 election and the COVID-19 pandemic pose an existential threat to American democracy and public health. Public opinion surveys reveal that high percentages of Republicans indicate that they endorse some aspects of mistaken beliefs surrounding election fraud in the 2020 election. Still, understanding how to measure the endorsement of misperceptions is critical for understanding the threat at hand. Are high levels of mistaken beliefs genuinely held, or are they partially a function of expressive responding? I address this question through a set of survey experiments encouraging accuracy-oriented processing among the general public. Using well-powered surveys of Republicans and Independents, I find that treatments designed to encourage more accurate responses are ineffective in reducing the endorsement of partisan electoral and public health misperceptions and can in some cases even backfire. These findings suggest that support for these misperceptions is genuinely held.
