Senator Approval Rankings Q1 2018 Methodology

Morning Consult conducted surveys with 275,358 registered U.S. voters from Jan. 1 through March 31, 2018 to determine the Q1 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.