By Jim EllisJune 22, 2018 — A new West Virginia statewide survey testing the important US Senate race between Sen. Joe Manchin (D) and Attorney General Patrick Morrisey (R) done by Monmouth University was just released showing Manchin leading Morrisey 50-43 percent, but the polling sample spurs methodological questions.
Monmouth surveyed 653 West Virginia voters between the June 14-19 period, but 428 of them were from the 3rd Congressional District. The sample was heavy in the state’s open southern CD because the pollsters were also testing the US House contest between state Sen. Richard Ojeda (D-Logan) and state House Majority Whip Carol Miller (R-Huntington). The northern 1st District contributed only 87 voters to the sample, while 138 came from the 2nd CD.
To ensure a more representative statewide sample, the Monmouth pollsters weighted the data to compensate for the major discrepancy. But, the weighting still reports that 34 percent of respondents are from the 1st District, 34 percent from the 2nd, and 32 percent from the 3rd, which still gives the latter district the overwhelming preponderance of respondents.
Monmouth reports results under several turnout models. A “potential” voter is one who has participated in at least one election since 2010. A series of responses were also included under a “likely voter” model in what they describe as a “standard midterm election”, while a final response set comes from one that projects a “Democratic surge.”