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.
Democratic candidates are either avoiding border issues or talking about them on Republicans’ terms. And the party’s grass-roots allies are struggling for cash and battling burnout.