Some of the House’s most competitive primaries have been decided across Arizona, teeing up midterm races that could help decide which party controls the chamber after the midterms. Two of the most significant races took place in Arizona’s 1st District, which the Cook Political Report and the University of Virginia Center for Politics rate as a “tossup” in November. In the fight for the Democratic nomination, Dr. Amish Shah defeated former journalist Marlene Galán Woods, businessman Jonathan Treble, and tech-media veteran Rick McCartney. As of 10:00 p.m. ET on Wednesday, Shah had received 39.8 percent of the vote. Galán Woods trailed him with 34.1 percent, with Treble in third at 17.6 percent....