Borah was born in rural Illinois to a large farming family. He studied at the University of Kansas and became a lawyer in that state before seeking greater opportunities in Idaho. He quickly rose in the law and in state politics, and after a failed run for the House of Representatives in 1896 and one for the United States Senate in 1903, was elected to the Senate in 1907. Before he took his seat in December of that year, he was involved in two prominent legal cases. One, the murder conspiracy trial of Big Bill Haywood, gained Borah fame though Haywood was found not guilty and the other, a prosecution of Borah for land fraud, made him appear a victim of political malice even before his acquittal.