The issue of transparency in Greitens’ personal and political dealings would dog the first-time officeholder until he resigned under the cloud of scandal on June 1.

The poll of 625 registered likely voters by Mason-Dixon Polling & Research found that 68 percent believed candidates should be required to release their returns. By contrast, 21 percent said they should not, with 11 percent not sure, the survey found.

University of Missouri-St. Louis political scientist Dave Robertson said voters are interested in tax returns to help them vet their candidates.

“I think people would like to know whether or not a candidate has received money from controversial sources, made controversial expenditures or accepted controversial tax breaks,” Robertson said.

There are no state or national requirements for people seeking office to release their tax returns. But it has become commonplace in presidential campaigns, except for Republican Donald Trump during his 2016 campaign for president.

Robertson said Trump’s refusal to release his tax returns may have “legitimized” the practice.