Easy, new senate rules go into effect in January preventing former senators from lobbying colleagues for one year after relinquishing their seat. he didn't want to lose the bank he was planning on getting next year.
I think it is because his hairpiece wants to see Europe.
Or the VECO snitching has caught up with him.
Or maybe his Plantation home has fallen apart and he needs to run home and spend more time managing his slaves and the cotton harvest crop.
Or maybe he is teaming up with Delay and opening a lobbying firm. They can use the slogan "We stole us some money and done whupped us some niggas and we ain't in jail yet. So we can git it done for ya"