Senator Approval Rankings Q3 2018 Methodology

Morning Consult conducted 359,057 surveys with registered U.S. voters from July 1 through Sept. 25, 2018 to determine the Q3 2018 Senator Approval Rankings.

In each poll, Americans indicated whether they approve or disapprove of the job performance of their U.S. senators. For each question, they could answer strongly approve, somewhat approve, somewhat disapprove, strongly disapprove, or don’t know / no opinion.

Morning Consult obtained an up-to-date list of senators from Sunlight Foundation’s Congress API v3 and Open States API. Survey respondents were assigned to their appropriate senators based on their state of residence.

Morning Consult obtained population parameters for registered voters from the November 2012 Current Population Survey. We applied post-stratification weights based on gender, age, educational attainment and race.

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