ANCHORAGE, Alaska—A rural Alaska man who threatened to assassinate both of Alaska’s U.S. senators in a series of profane messages left at their congressional offices was sentenced Friday to 32 months in prison. Jay Allen Johnson was also fined $5,000, ordered to serve three years of supervised release after his prison sentence, and is barred by a protective order from contacting U.S. Sens. Lisa Murkowski and Dan Sullivan, their family, and staff members for three years. “Nothing excuses this conduct, threatening our elected officials, an act that attacks our very system of governance,” U.S. Attorney John E. Kuhn Jr. of the District of Alaska said in a statement. “The erosion of civility in our political discourse will never justify threats or acts of violence. Johnson’s actions must be punished, and the Department of Justice will always work to ensure our elected officials can serve without fear of harm.” Johnson, who …