The National Republican Congressional Committee is jumping into one of Arizona’s most competitive races with $900,000 in airtime in the 9th Congressional District.

The battle between Democrat Kyrsten Sinema and Republican Vernon Parker over Arizona’s new 9th Congressional District will be close. That’s about where most predictions begin and end.

Democrat Kyrsten Sinema holds a narrow lead over Republican Vernon Parker in Arizona’s 9th Congressional District, according to a poll commissioned by Sinema supporters.

But after testing a slew of negative messages against both candidates, Sinema’s lead widened to double digits.

As Vernon Parker seeks to clear his name in allegations that led to his company’s termination from a federal program, his Democratic rival for Arizona’s 9th Congressional District is bringing back an issue that hounded him in his last run for Congress.

Since Kyrsten Sinema first began eying a run for Congress, a question loomed over her candidacy — could someone whose own party once called her too extreme win in a moderate district?

In a showcase of post-primary unity, Kyrsten Sinema announced the endorsements of two high-profile supporters of her opponents in the Democratic primary for Arizona’s 9th Congressional District.

The Democratic primary in Arizona’s 9th Congressional District was one of the most high-profile races in the state, but it was Republicans who turned out en masse to cast their ballots.

Kyrsten Sinema handily won the Democratic primary for Arizona’s 9th Congressional District, earning a 12-point win in a hard-fought contest between three of the Democrats’ most prominent rising stars.

Democrats Andrei Cherny and Kyrsten Sinema were the only candidates on either side of the crowded 9th Congressional District primary field to raise $100,000 in the most-recent period, while none of the seven Republicans in the race hit the $50,000 mark.

In Arizona's brand-new 9th Congressional District, three Democrats and seven Republicans are vying to win the upcoming primary so they can move on to what could turn out to be a nasty fight for the seat, given that it's one of few toss-up races in the state and the field is so wide.