He really said it, according to the Daily Kos in October 2012. He is Arkansas State Representative Loy Mauch, Republican. Between 2000 and 2011 he wrote a lot of letters to the Arkansas Times.
One such letter said:
Nowhere in the Holy Bible have I found a word of condemnation for the operation of slavery, Old or New Testament. If slavery was so bad, why didn’t Jesus, Paul or the prophets say something?
This country already lionizes Wehrmacht leaders. They go by the names of Lincoln, Grant, Sherman, Sheridan, Custer, etc. These Marxists not only destroyed the Constitution they were sworn to uphold, but apostatized the word of God. Either these depraved infidels or the Constitution and Scriptures are in error. I’m more persuaded by the word of God.
I have an answer for his question. Why didn’t Jesus, Paul or the prophets say something? Because they, and/or the people who wrote in their names, were just people. They were just as shitty as the other people around them. They didn’t “say something” because they weren’t moral giants. If you think the bible is the last word on morality, you’re a moral pigmy, or a flea.