President Abraham Lincoln officially became a lawyer on Sept. 9, 1836, when he received his law license. Fellow politician and attorney John Todd Stuart, a key figure in Lincoln's political career, strongly influenced Lincoln in his decision to become a lawyer.
John Todd Stuart loaned Lincoln law books so that he could study to become a lawyer. Lincoln went into partnership with Stuart in 1837 when he moved to Springfield, Ill. Lincoln was frequently hired by the Illinois Central Railroad to be its attorney and established a respectable record for himself. Lincoln was elected president in the 1860 election. He married Mary Todd and had four sons.