Sexism is weighing down the women running for the Democratic presidential nomination, a new public opinion survey conducted by Ipsos for The Daily Beast reveals.

A full 20 percent of Democratic and independent men who responded to the survey said they agreed with the sentiment that women are “less effective in politics than men.” And while 74 percent of respondents claimed they were personally comfortable with a female president, only 33 percent believed their neighbors would be comfortable with a woman in the Oval Office.

That latter number, explained Mallory Newall, research director at Ipsos, was a strong tell about how gender dynamics were souring voters on certain candidates. Asking respondents how they believe their neighbors feel about an issue is “a classic method to get around people being reluctant to admit to less popular views.”

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The discomfort that voters have with female candidates helps explain one of the persistent undercurrents of the current election. In various hypothetical general election matchups, the male Democratic candidates have consistently done better against President Trump than their female counterparts.