CNN views more than half of Arizona's congressional districts as in play this year, with the 2nd District vacated by McSally as the most likely to flip. Jeff Flake. Martha McSally, a U.S. House member who was the first female Air Force pilot to see combat, won a majority of the Republican primary vote.
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Sinema said she thought the momentum generated by the Red For Ed movement and overall Democratic engagement would help her wage a strong campaign.
However, Flake, who is retiring at the end of his term, had no such exchange with McSally and has not endorsed a candidate since Roy Moore and now-Senator Doug Jones ran against each other for the Alabama seat.
All three have fought over who is closest to Trump and most enthusiastic about his agenda, highlighting the praise Trump has offered them over the past few years.
The race is to succeed retiring Sen.
Without wasting much time, Flake replied to Trump on Twitter, saying his claim about an attempted endorsement was false. All three, including establishment favorite Rep. Martha McSally, have embraced Trump and distanced themselves from McCain - a sign of how far the late senator's status had fallen with conservatives who dominate Arizona's GOP primaries. John McCain's ailing health caused a last-minute controversy.
Florida Gov. Rick Scott easily captured the Republican nomination in the GOP's bid to unseat Democratic incumbent Sen.
"What makes this race unique is that in nearly every criteria, they're equally qualified in terms of money and campaign experience", she said.
Tallahassee Mayor Andrew Gillum, who would be the state's first black governor, and Republican congressman Ron DeSantis both defeated more moderate opponents aligned with their parties' establishment.
Trump yesterday reiterated his support for DeSantis in a tweet. And lest there be any question about his allegiance to Trump's divisive immigration policies, DeSantis encourages his toddler to "build the wall" with blocks in one campaign ad.
Trump carried Florida by just over 1 percentage point in 2016. In the Democratic primary, former HHS Secretary Donna Shalala faces tough challenges from State Rep. David Richardson and Michael Hepburn, a former academic adviser at the University of Miami. 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.
That measure is a useful way to assess which party is more excited about a midterm election, and it's particularly useful in Florida because the state limits primaries only to voters registered by party.
Both Arizona and Florida were holding primaries for several competitive US House races that could prove crucial for the Democrats' chances to take control of the House.
Republicans picked the candidate backed by the party establishment and seen by analysts as the GOP's best chance at holding the open seat in what is shaping up to be a hard election for the party.