So You Led A Failed Rebellion, Then What?

I was surprised to read yesterday that, after the American Civil War ended in 1865, Jefferson Davis, the President of the Confederacy, lived another 25 years. He spent only two years in prison after the war, apparently, and yesterday was the anniversary of his release in 1867. What did he do for the rest of his life, I wondered?  How do you follow-up leading a failed rebellion and a ruinous, 5-year civil war?

"Sell life insurance" would not have been my first guess.  But according to Wikipedia, he initially became President of the Carolina Life Insurance Company before, amazingly, being re-elected to the U.S. Senate in 1875.  He was barred from  taking that office, apparently, but I wonder whether, if he had been allowed, he would've strode down the aisle of the Senate apologizing to everyone ("sorry... sorry... terribly sorry.... won't happen again...") or triumphantly, with purpose and head held high ("Don't Call It A Comeback!").