Yes, good catch. There used to be some sort of auto plant there. If it is a GM plant that tells the sorry tale.
Les Aspin held that district with Janesville, Kenosha, Racine, and some Milwaukee burbs for 20 years. It's not Janesville that helps Paul Ryan. He just lives there. It's parts of Waukesha County which is one of the biggest Republican strongholds in the nation.