Even before Tuesday’s primary votes are tallied, North Carolina is gearing up to host the most pivotal — and most expensive — governor’s race in the country this fall. Leading in the polls and in fundraising, two statewide elected officials, Democratic Attorney General Josh Stein and Republican Lt. Gov. Mark Robinson, are expected to advance to the general election to replace term-limited Democratic Gov. Roy Cooper. The stakes are high for North Carolina. With Republicans in solid control of the state Legislature, they have an opportunity to win a trifecta come November. The stakes will also be high nationally. Of...