The alleged masterminds of an extremist plot to kidnap Michigan Gov. Gretchen Whitmer and start a civil war ahead of the 2020 presidential election will be re-tried after a jury failed to reach a verdict in their cases earlier this year. A federal judge set a trial date in August for Adam Fox and Barry Croft Jr. Thursday after declining their lawyer’s request to clear them of conspiracy and weapons charges. “We don’t know what the jury was thinking. … There’s enough here to say that a rational jury could still go against Mr. Fox, go against Mr. Croft, even...