Despite a distressingly low signal-to-noise ratio in this year’s presidential contest, Americans have taken the measure of both candidates. Now, thanks to a fine-grain poll by Quinnipiac University, we can see what they think.

Only 32% of likely voters believe that Mrs. Clinton is honest, compared with a larger but still dismal 40% for Mr. Trump. Fifty percent think he is “honest enough” to be president, while only 43% think she is. Just 37% say she is more transparent than Mr. Trump; 54% say the opposite.

Asked to explain why they do not regard Mrs. Clinton as honest enough to be president, roughly equal shares of the naysayers cite her private email server, the Benghazi attack, and their impression of her as evasive and calculating. (Only 39% believe that she bases her policies on a set of core values.) And 34% of the electorate, including 38% of independents, say that her use of a private email server changed their opinion of her honesty.

Clearly Mrs. Clinton’s burning desire to preserve what she once called a “zone of privacy” has cost her dearly, and not just because it has made her appear less than honest and transparent. Asked whether she believes that she has to play by the same rules as everyone else, only 42% of the electorate responds affirmatively; 56% think she does not believe that the rules apply to her. It is unlikely that she will be able to reverse these impressions by Election Day.

If the news is bad for Mrs. Clinton, it is much worse for Mr. Trump. Seventy-five percent of likely voters think he should publicly release his tax returns, and 59% do not believe that his stated reason for not doing so—the continuing IRS tax audit—is the real reason. A healthy majority, 61%, believe that “the way Donald Trump talks appeals to bigotry.” This judgment extends well beyond minority voters to include 61% of whites with college degrees and 56% of whites overall.