BOISE, Idaho (AP) — After Tuesday, Idaho voters will not only narrow the candidates in each primary race but they will also reveal how much the tea party has reshaped the state's Republican Party.

With Idaho's strong red state roots, the GOP primary is often considered the most competitive leg of the election because Republican candidates rarely face a strong Democratic challenger in November.

At the forefront of the primary election is the closely contested gubernatorial race between two-term incumbent Gov. C.L. "Butch" Otter and state Sen. Russ Fulcher. Like most of the incumbents running for re-election for a statewide post, Otter faces a challenger favored by the tea party.

Tea party favorites are also running competitive races for secretary of state, superintendent of public instruction and attorney general.