The most endangered Senate Democrat portrayed her Republican opponent as an election-denying extremist, defying national headwinds in a race that stayed tight until the end.
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.
With sheriffs vouching for them and a flood of ads proclaiming their support for the police, Democrats are shoring up their public safety bona fides. Still, some worry it’s too late.
Senator Catherine Cortez Masto is trying to hold off her Republican rival, Adam Laxalt, as both parties shovel money into a pivotal contest defined by two of this year’s top issues.