Two weeks ago, EPIC-MRA of Lansing, a polling firm that does work for the Free Press, released a survey showing former Vice President Joe Biden, the presumptive Democratic nominee, leading Trump 53%-41% in Michigan, a 12-point edge.

But a second poll, started on May 31, a day after the first poll began, and concluded a day later, on June 4, showed Biden leading Trump 55%-39% in Michigan, a 16-point margin. As it did for the first poll, EPIC-MRA surveyed 600 randomly selected likely voters for the second one, which had a margin of error of plus or minus 4 percentage points…

While it’s not known for certain what caused the change, the second survey added a day of polling in the immediate aftermath of law enforcement and military personnel on June 1 forcefully clearing peaceful protesters from a public square outside the White House. They used pepper spray and smoke canisters to move the crowd so Trump could have his photo takenholding a Bible outside St. John’s Church, which had been damaged in another protest.