There's some museum of tractors or something, it's a bunch of parked and polished tractors in an industrial building. I'm not sure of the details, but politicians seem to like to use it to film from. The tractors behind Joe are not current models like you would see at a Deere factory, they're museum pieces.

In general politicians like to stage photo ops at places that invoke some emotion in the viewer. Sometimes that's a fake set with a green screen, and sometimes they'll show up at actual locations.