Listen to an audio version of this story below: Plumbers and Steamfitters Local Union 33 has a sculpture of two 20-foot wrenches emerging from the mud out by its pocked parking lot in Des Moines, Iowa. Inside, a public bathroom features a shower adorned with gone-gray towels and multiple containers of industrial-strength body wash, presumably for cleaning up after some kind of toxic toilet encounter. It is all very manly. If this were a Joe Biden event, the ex-VP would just grunt “Scranton, Scranton” for 30 minutes before waving and disappearing back into his motorcade. But it’s not. South Bend Mayor Pete Buttigieg sits up front. Well, he sits for a moment but then stands because he is not tall. He is jacketless, and wearing one of his 612 white-shirt-and-blue-tie combos. The outfit and his Supercuts haircut make him look like the guy whose plot arc was cut out of Office Space. He fields a question from a voter about his favorite book. Buttigieg is ready. He extols the connection between the American worker’s daily struggles and, uh, Leopold Bloom. “I’ve got to go with Ulysses,” says Buttigieg. When he ran for Indiana state treasurer in 2010, his staff told…