Mr. Talarico is an early test. In 11 days he faces progressive steamroller U.S. Rep. Jasmine Crockett in the Senate primary. If he’s got a shot, it’s because a growing number of Democratic money men and influencers see in the 36-year-old Presbyterian seminarian one answer to their cultural alienation from voters. As one booster recently put it, Mr. Talarico’s faith is a potential draw to Texan voters who feel the Democratic Party “doesn’t respect their religion.”