when did he begin his political career?
1880
Thomas R. Marshall
In 1880 Marshall ran for public office for the first time as the Democratic candidate for his district's prosecuting attorney. 
who is thomas r. marshall? An American politician who served as the 28th vice president of the United States where was he born? North Manchester, Indiana what was his early career? Lawyer
wiki:19592039
Thomas R. Marshall [SEP] Law practice
Despite their nineteen-year age difference, the couple fell in love and married on October 2. The Marshalls had a close marriage and were nearly inseparable, and spent only two nights apart during their nearly thirty-year marriage. Marshall's alcoholism had begun to interfere with his busy life before his marriage. He arrived at court hung-over on several occasions and was unable to keep his addiction secret in his small hometown. His wife helped him to overcome his drinking problem and give up liquor after she locked him in their home for two weeks to undergo a treatment regimen. Thereafter, he became active in temperance organizations and delivered several speeches about the dangers of liquor.