Democrat Sen. Mark Kelly is running against Republican Blake Masters in Arizona's high-profile Senate race.
Polls closed in Arizona at 7 p.m. local time, or 9 p.m. EST, as freshman Democratic Sen. Mark Kelly of Arizona faces off against newly-minted Republican candidate Blake Masters in a highly charged race for the state's US Senate seat.
Embattled former President Donald Trump endorsed Masters in early June based on Masters' denial of Joe Biden's lawful victory.
His opponent, Masters, has raised $12 million, spent $9.4 million, and has $2.6 million of cash still left to spend, as of October 19.
Thiel's pro-Masters Saving Arizona PAC, for one, has poured more than $17 million into the race through September.