A Republican state senator known for gun-rights advocacy is planning to challenge Democratic Gov. John Hickenlooper next year.
Sen. Greg Brophy of Wray plans to launch his campaign Sunday in Parker.
Brophy joins a Republican slate hoping to challenge Hickenlooper. Former Republican U.S. Rep. Tom Tancredo is also in the race, and Secretary of State Scott Gessler and Arapahoe County District Attorney George Brauchler have said they're considering running.
Brophy represents a sprawling rural district in northeastern Colorado. He was appointed to the Senate to fill a vacancy in 2005 and is serving his second full elected term.
Brophy vigorously opposed gun control measures adopted this year after mass shootings in Aurora and Newtown. Conn.