Florida and Arizona hold primaries on Tuesday, teeing up the House and Senate races that will be critical to the balance of power in Washington come November.
The race is to succeed retiring Sen. Jeff Flake, who is retiring after his fierce criticism of Trump made his political future in the state untenable.
In an interview Tuesday with MSNBC's Kasie Hunt, Arpaio was asked if considered McCain, a war hero who died over the weekend following a long battle with brain cancer, to be a patriot. But Democrats were in a festive mood, as results showed that voter turnout, usually damp in mid-term elections, had edged up by around 5 per cent according to Ms Felecia Rotellini, the party's state chairman.
In a state whose electoral votes went to Trump, the Republican nominee could use voters' support for the president to their advantage.
Democrats, though, are hopeful of capturing one of Arizona's Senate seats for the first time in almost a quarter century, saying the GOP is wounded after a divisive primary that saw the party's conservatives split between Mr. Arpaio and Ms. Ward. The contest followed a pattern repeated across the country during this year's primaries, with those endorsed by or highly supportive of Mr Trump often winning the nomination - only to find moderate Republicans turning to the Democrats.
"You know who that person is?"
In Arizona, a Republican Senate candidate's reaction to Sen. With a consistently conservative voting record, Arizonans elected McCain to the Senate six times, including in 2016. The CNN survey found that 67 percent of Democrats had a favorable opinion of McCain, while just 33 percent of Republicans had a favorable view of the GOP senator.
Democrats must hold on to Sen. Kelli Ward, who tried unsuccessfully to unseat McCain in 2016. John McCain, which has spurred a debate about how far the party has moved to the right since his failed 2008 bid for the presidency.
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On Monday, Ward tweeted, "Political correctness is like a cancer!"
The hardcore anti-immigration Arpaio was pardoned a year ago by Trump after he was convicted of criminal contempt for defying a court order in a racial profiling case.
McSally, a fighter pilot turned congresswoman in the McCain mold, is hoping Ward and Arpaio split Arizona's anti-establishment vote. Outgoing Senator Flake, in recent months, had morphed into a critic of President Donald Trump, triggering a contest in which all three candidates did the opposite, trying their best to align to the President - who stayed out of endorsing any of them.
McSally has already launched advertising aimed at her likely Democratic opponent in November, US Representative Kyrsten Sinema. After McCain's death, Sinema and Ward suspended their campaigns for Wednesday and Thursday.
Sinema's and McSally's Senate runs also have created House openings in Arizona, a fast-growing and increasingly diverse state where Democrats are eager to gain a foothold.
A contest between Sinema and McSally is one of the most evenly matched of the cycle, said Jennifer Duffy, a senior editor at the non-partisan Cook Political Report, who is tracking Senate races.
Democrats are also eyeing pickup opportunities in Florida as they try to flip control of the House.