David Nierenberg has funded a lot of Republican candidates over the years. But when GOP Rep. Jaime Herrera Beutler lost her primary in August, he switched sides to fund Democrat Marie Gluesenkamp Perez over the Trump-backed Republican who advanced to the general election. “I immediately went to work,” Nierenberg said. “And I think I've now transformed myself from Jaime’s largest bundler to Marie's.” Gluesenkamp Perez’s campaign team confirmed Nierenberg has raised over $100,000 for her campaign from his network of moderate Republican donors since the August primary. But the money is only part of the story in a district that...