The 2028 election is more than 1,200 days away, but Democrats ranging from California Gov. Gavin Newsom to Sen. Ruben Gallego (D-Ariz.) are already positioning themselves for a White House campaign. It’s far too early to know exactly what issues will be top of mind for voters — or who the nominee will be — but history suggests that one topic that is likely to be important is that of perceived corruption in government.

A continuing theme for President Trump over the last decade since his first campaign was to “drain the swamp.” In each of his campaigns, Trump’s message on corruption met a sympathetic electorate.

According to the American National Election Study, a major national political science survey conducted every two to four years, the percentage of Americans who believe most government officials are corrupt has........

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