With the 2024 election cycle kicking into gear this year, both parties are facing their toughest obstacles yet, with national Republicans seeking to protect their most vulnerable members in competitive contests from defeat in November.

House Republicans, in particular, are facing many difficulties stemming from infighting and aggressive Democratic targeting that has resulted in a shift in several races’ projections. Some GOP lawmakers, once finding themselves in a solid, likely Republican position, are facing the reality that their contest may be much closer than they thought.