Retired Army Capt. Sam Brown officially launched his campaign Monday in the Nevada Senate race to take on Sen. Jacky Rosen. Brown ran for the Senate seat in the last electiont cycle but lost to Adam Laxalt in the GOP primary. Laxalt went on to lose to Catherine Cortez Masto. Brown will take on election denier Jim Marchant, whose most recent loss was in the race for Secretary of State.