Maryland Senator Ben Cardin announced on Monday that he will not seek reelection in 2024, sparking speculation about who will replace him in the blue state. Potential candidates include Rep. Jamie Raskin, former Maryland Gov. Martin O’Malley, former Rep. John Delaney, and former NAACP President Ben Jealous. Cardin has been a reliable and amiable rank-and-file Democrat, and the race to replace him is expected to heat up in the coming months.