Matt Bennett can still hear the reporters laughing, all 90 of them. He can still picture Sam Donaldson doubled over, guffawing, on a riser that looked out over a dusty field in suburban Detroit. Bennett was a 23-year-old political rookie in 1988 when he was sent to a General Dynamics facility in Sterling Heights, Mich., to organize a campaign stop for Democratic presidential nominee Michael Dukakis: a ride in a 68-ton M1A1 Abrams Main Battle Tank. The visit, meant to bolster the candidate’s credibility as a future commander-in-chief, would go down as one of the worst campaign backfires in history....