One In the Chamber by Robin Peguero

On Capitol Hill, they work you to death.
Cameron Leann is new to Washington, D.C. An Iowa farm boy without a penny to his name, Cam has joined a group of affluent junior staffers working for a powerful cohort of U.S. Senators known as The Gang of Six. Liz Frost, the group's charismatic leader, teases and strings Cam along as he grows increasingly infatuated with her. Heir to a political dynasty, Randy Lancaster pushes Cam to his limits with his penchant for booze, drugs, and meaningless flings. Charlie James, Liz's linebacker boyfriend, keeps Cam at a distance, eyeing the newcomer with suspicion.
All of them have one thing in common. They hate their bosses.
As the Gang of Six takes up the rushed nomination of the first Black chief justice to the Supreme Court, Cam and his friends are plotting against them. But in the game of politics, one's motivations are never as they seem-especially true for Cam, the enigmatic figure at the center of it all.
When a bombshell revelation threatens to sink the President's Supreme Court pick, the Gang of Six fractures, pitting senator against senator in a confirmation battle for the ages. Alliances shift with the wind. Everyone is lying to everyone. And on Election Night, one senator will end up dead.