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Arizona's governor race decides who leads a state that has become one of the most closely watched political battlegrounds in America, often swinging narrowly between the two main parties in recent elections. Katie Hobbs, the current governor and a Democrat, is standing for a second term. She now knows her opponent will be Andy Biggs, a Republican who has served in Congress and has the public backing of former President Donald Trump.

Trump's endorsement matters because it signals which candidate the Republican Party's base is expected to rally behind, and because his backing has helped decide the outcome of several other primary contests this year. Arizona is watched closely nationally because its governor has influence over how elections are run in the state, among other powers, which has made the role politically significant in recent years.

With the primary now settled, the contest moves to a general election campaign running through to a vote in November, in which both sides will compete for a state that neither party can take for granted.