Doug Ducey, the outgoing governor of Arizona, spent $82 million to stack shipping containers along the border with Mexico. His successor, Katie Hobbs, calls it a waste of money.
Senator Mark Kelly, a Democrat, holds an edge in his bid for re-election, but the race for governor appears to be a true tossup, even as several Republican candidates sow doubts about the results.
In Arizona and Nevada, Republicans’ path to victory appeared to narrow, though both races remain close. The G.O.P.’s odds of success are greater in the House.