We used three approaches to test for associations between the ACA open-enrollment period and coverage changes, using the largest national daily poll on health issues, the Gallup–Healthways Well-Being Index (WBI). First, we assessed coverage changes in the fourth quarter of 2013 and the first two quarters of 2014, using multivariate regression to adjust for the preexisting trend and potential confounders such as employment, income, and demographic characteristics.