California Central Valley District Race Could Determine Which Party Rules Congress

With the balance of power in the U.S. House of Representatives at stake in the November election, a race in California’s Central Valley could play a pivotal role, as incumbent Republican John Duarte is set for a rematch against former Assemblyman Adam Gray, a Democrat. Six seats separate the two parties in the House, meaning a flip of four seats could give Democrats control of the chamber if all other seats are held. As the only two candidates vying for the 13th District in the March 5 primary, Mr. Duarte and Mr. Gray are guaranteed to appear on the presidential ballot later this year, but Tuesday’s results could set the tone for what to expect in November....