By at least 1860 Clemens had come to the conclusion that
slavery was morally wrong, and had worked for the election of
Republican Abraham Lincoln. Following Lincoln's election as president that year, Clemens was appointed Secretary to the new government of the
Territory of Nevada at a salary of $1,800 a year. His younger brother Sam accompanied him to Nevada Territory in the summer of 1861. Sam would later write about this journey in his semi-autobiographical book,
Roughing It. Sam drifted into mining and newspaper work, while his brother served as Territorial Secretary and often as acting governor when
James W. Nye was outside the territory. It was while acting as temporary governor that Orion gained political popularity by avoiding a "Sagebrush War" with California over disputed state boundary lines. He built a home in
Carson City and brought his wife, Mollie, and young daughter, Jennie, to Nevada a year after his arrival. Jennie died there in February 1864. Clemens offered strong support of the newly formed government in Carson City, paying out of his own pocket for the printing of the House and Senate Journals and to furnish the two territorial legislative chambers. After the Territory became the thirty-sixth state of the US on October 31, 1864, Clemens tried to secure the nomination for Nevada
Secretary of State. Clemens, "a confirmed teetotaler since his days as a printer's apprentice in St. Louis", took a strong position against the availability of whiskey, which lost him much support. The death of his only child also permanently dampened the spirits of the often moody Orion, making effective campaigning difficult. The following year, he served a brief time as an elected
state assemblyman. However, the meager salary of a legislator and his inability to develop a successful law practice led him to leave Nevada in August 1866, forced to sell their home for a financial loss. ==Later life==