Rep. Jared Golden, who has twice won one of his party’s Trumpiest seats, is the kind of Democrat that campaign operatives would love to clone in battleground races around the country. Yet that obsession with his political brand is a big part of what the millennial Mainer says is wrong with Washington.
Golden last fall outperformed President Joe Biden by the widest margin of any Democratic incumbent in the chamber, the kind of win that often makes a future star. As attractive as his...