Former CSU athletic director Jack Graham has qualified for the Colorado Republican primary for U.S. Senate.
The secretary of state's office said Wednesday that Graham's campaign submitted enough voter signatures from each of Colorado's seven congressional districts to make the ballot.
Graham joins El Paso County Commissioner Darryl Glenn in the June 28 primary. Glenn won 70 percent of delegate votes at the state GOP assembly earlier this month.
Like Graham, businessman Robert Blaha, former state Rep. Jon Keyser and former Aurora city councilman Ryan Frazier are petitioning their way onto the ballot.
Their voter signatures are being counted by the secretary of state's office.
Democratic Sen. Michael Bennet is unopposed in his primary as he seeks re-election.