The upcoming election season might be more competitive than predicted.
The alarms came after Senator Mitch McConnell, the Republican leader, called such a ban “possible” if a leaked Supreme Court opinion became final and his party gained control in Washington.
National Republicans had been trying to recruit Gov. Chris Sununu to compete for a Democratic-held seat that the G.O.P. believed could determine control of the Senate.
Senator Maggie Hassan, a former governor of her state, is working to burnish her centrist image without making political waves.
Here are 12 women who are under serious consideration by Mr. Biden, and why each might be chosen — and might not be.