COLUMBIA, S.C. -- Former Attorney General Henry McMaster is running for lieutenant governor, four years after his unsuccessful bid for governor.

McMaster filed his candidacy Thursday with the state Election Commission. His entrance sets up a GOP primary race for the state's No. 2 post featuring two well-known political names and a retired developer who's already loaned his campaign $250,000.

All three have ties to Gov. Nikki Haley.

McMaster has been a close ally to the governor since losing to her in a four-way primary in 2010. The two-term attorney general had been the front-runner until Haley surged ahead late in the campaign.

Mike Campbell is the younger son of the late Gov. Carroll Campbell, whom Haley calls a role model.

Pat McKinney is Haley's appointee to the State Ports Authority.