Another reason Democrats will have difficulty retaking the US Senate this fall: Republicans’ historical advantage in holding open seats
This fall, the Democrats face a challenging US Senate map, defending 25 seats to the GOP’s nine. For some on the left, one ray of hope has been the retirement of four Republican Senators, leading to open seat contests. In new research, Hanna K. Brant, L. Marvin Overby, and Theodore J. Masthay suggest that this optimism may be misplaced. […]