All four members of the U.S. House from Utah are facing Republican primary challengers Tuesday while the Democratic challengers they’ll face in November are running uncontested. It is the first primary election since the GOP-controlled state Legislature bypassed an independent redistricting commission and approved political maps that critics decried as gerrymandered because they split up Democratic-leaning Salt Lake City, effectively shoring up Republican advantages in each of the state’s four districts. The night’s headline race is for the U.S. Senate with Republican Mike Lee trying to fend off two challengers in his bid for a third term. In the U.S....