Why did this Mississippi politicians advocate secession?

Mississippi politicians advocated for secession primarily due to their commitment to preserving slavery, which they viewed as essential to their economic and social system. They believed that the election of Abraham Lincoln, who opposed the expansion of slavery, threatened their way of life and state's rights. Additionally, they sought to assert their sovereignty and protect what they saw as their interests against perceived federal overreach. Secession was seen as a necessary step to maintain their autonomy and protect the institution of slavery.